Windows

1. Perform a disk integrity check by clicking 'Start,' then 'Run,' and then typing 'chkdsk C: /f' (without quotes). If you are prompted to restart your computer, press the 'Y' key followed by the 'Enter' key on your keyboard.
2. Perform a complete registry scan, if the problem still exists, using a program like Registry Mechanic or Registry Easy. If any errors are detected, correct them and restart your computer.

3. Use the Windows installation disk, if the Microsoft errors reoccur, and boot with it by inserting it in your optical drive and rebooting your computer.
4. Wait for the setup to initialize, accept the License Agreement that appears and press 'R' when you get to the screen where Windows found an existing installation and offers a repair option.

1. Rule out problems with your computer. Start by defragmenting your disk. Click the 'Windows' button in the lower-left corner of your computer screen and select 'Control Panel.' Click the 'System and Security' icon. Choose 'Administrative Tools,' then 'Defragment your hard drive.' This will clear up clutter on your hard drive that could be causing the error.
2. Use the CHKDSK program in Windows to see if there are other problems with your hard drive. Click the 'Windows' button and select 'Computer.' Right-click the drive with the CRC error. Choose 'Properties,' then select the 'Tools' tab. Click 'Check Now.' Make sure the program will fix disk errors by checking the top square in the dialog box. Click 'Start.'

3. Clean your CD or DVD, if the CRC error appears to be caused when you're copying data or a program from optical media. You can also clean your optical drive with short, gentle bursts of compressed air or a commercial CD cleaning product. Be extremely careful when you clean an optical drive; it's easily damaged by excessive pressure.
4. Ask the person or company who provided the file or media to give you a new copy. Often, this is the quickest and most pain-free solution to resolving a CRC error. Be sure you've ruled out problems with your computer before resorting to this step.

Download the Latest Version of Windows Media Player
1. Launch your web browser by double-clicking its icon on your desktop. Go to the Windows Media Player page of Microsoft's website (see Resources). Locate your operating system in the left-hand column and then click on the link in the right-hand column ('Recommended Player version').
2. Download Windows Media Player. Click the 'Download Now' button if you are downloading WMP version 10 or earlier. Click 'Continue' if you are running Windows Vista and downloading WMP 11. Then enter your 25-digit Microsoft Product Key (located on the green sticker on the base of your laptop or on your desktop tower). Click 'Download Now' after validation.

3. Install Windows Media Player by clicking 'Run' or 'Install.' Click 'OK' to begin the installation wizard, then click 'Next' or 'OK' to progress through each stage of the installation. Click 'Finish' to complete the installation.
4. Restart your computer.
5. Open Windows Media Player and try to play the video or audio file that prompted the error. If you still receive a 'fix codec error,' proceed to Section 2.
Turn On the Auto-update Function
6. Launch Windows Media Player by double-clicking its icon on your desktop.
7. Click on 'Tools' in the top menu bar and then highlight and click 'Options.' If you do not see 'Tools' or a top menu bar, click on the 'Layout Options' button (it looks like a square) and then highlight and click 'Show Classic Menus.'
8. Click the 'Player' tap in the 'Options' application window. Check the box next to 'Download codecs automatically' and then check the box next to 'Once a day' to set the frequency of downloading codecs.
9. Try to play the video or audio file that prompted the error. Wait 24 hours for WMP to download all the codecs available then try and play the file again.

1. Write down any information printed on the blue screen when it flashes up, such as an error number and any information listed in the driver information section. This information may help you narrow down the problem.
2. Reboot your computer. If you see an option screen, choose “Attempt to start Windows normally” by pressing “Enter” when the option is highlighted. Sometimes simply restarting your computer will get rid of the fatal blue screen.

3. Press “F8” repeatedly when your computer is starting up if you were unable to reboot successfully. This takes you to the “Windows Advanced Options” menu screen.
4. Select “Safe Mode” by pressing “Enter” when the option is highlighted. This will load Windows with only necessary drivers and no automatically loaded software.
5. Run a spyware and antivirus scan of your system if Windows loads in safe mode. If your spyware or antivirus program finds and removes anything, restart your computer normally to see if it loads.
6. Restart your computer in safe mode if you cannot start Windows normally after running a spyware and antivirus scan.
7. Right-click “My Computer” and select “Properties.” Click on the “Hardware” tab and click “Device Manager.”
8. Expand the corresponding section for any drivers you recently installed or updated by clicking on the plus sign next to the category. Select the device that corresponds to any recently installed or changed drivers.
9. Click “Roll Back Driver” to go back to a previous driver version. Click “Uninstall” to completely remove a recently installed driver that may be causing the fatal blue screen. Do not uninstall motherboard or video drivers.
10. Reboot your computer normally to see if any drivers were causing the issue.
11. Reboot Windows in safe mode if rolling back or uninstalling recently changed drivers did not solve the problem.
12. Click on the Windows “Start” button. Select “Run.” Type “msconfig” into the “Run” text box, omitting the quotation marks. This brings you to the “System Configuration Utility” screen.
13. Click on the “Startup” tab and remove the check marks next to any programs that you recently installed. Do not remove the check marks next to “userinit.exe” or “explorer.exe.” Do not remove the check marks next to any other Microsoft programs unless you know what it is.
14. Press “F8” repeatedly when your computer is starting up to get to the “Windows Advanced Options” screen if your computer will not boot up in safe mode.
15. Press “Enter” when “Last known good configuration” is highlighted to attempt to boot Windows with the last settings you had that worked. If Windows loads normally, it should get rid of the fatal blue screen. Do not reload any software or drivers that you installed after the last good restore point.
16. Remove any hardware you installed in your PC and any new peripherals, such as external hard drives or CD drives, before the fatal blue screen appeared. Attempt to reboot your computer.

1. Read the screen. The error could be something as simple as a power interruption during shut-down or startup. The screen itself will offer the chance to start Windows normally. This is already selected by default. Try it first by pressing the 'Enter' key on your keyboard. If it works, after Windows loads, shut it down again properly. Allow it to reboot.
2. Try another of the choices on the blue screen. If starting Windows normally doesn't work, try the option to use the last known good configuration. You will need to use the arrows on your keyboard to move the highlight bar to that option. After that choice is highlighted, press your 'Enter' key. If it works and you boot into Windows, shut down and restart the computer normally.

3. Choose to start in safe mode. If the other two choices don't work, use the arrow keys to select the option to start in safe mode. As before, if the computer boots into the selected option, shut down and restart.
4. Take drastic measures. This is chosen last because it will fully reset your computer. This option will restore the computer to its original factory settings and removes all files and programs that you have installed. To use this option, shut off the computer and turn it back on. Press the 'F10' key repeatedly while the computer is attempting to reboot. This triggers an MS DOS-based program that is in every version of Windows. This will restore your computer and eliminate the blue screen error.

1. Hit the 'Windows' and 'F' keys on the keyboard simultaneously to bring up the Search window. Search for 'QuickTimeInstaller.exe' and 'iTunesSetup.exe,' without the quotes. Delete all copies of both files.
2. Open Internet Explorer. In this window, click 'Tools,' then click 'Internet Options.' Click the 'General' tab. Under the 'Browsing history' category, click the 'Delete' button. This removes all of the temporary files Internet Explorer saved, and may take several minutes on slower computers.

3. Close Internet Explorer and then reopen it. Browse to the iTunes website and download a new copy of iTunes. The copy should install without any difficulty.

1. Update your chipset driver. Navigate to the manufacturer's website for either your PC (if you bought it prebuilt) or to the motherboard manufacturer's website. Download and install the driver. Driver software is usually located under the 'Support' page found on many manufacturer's websites. Restart your computer to ensure proper driver installation.
2. Update the software in which the error occurs. Software such as video games are often updated by their developers via patches, which may fix the issue. Navigate to the website of the application and check for updates or patches. Download and install the most recent patches for that software.

3. Lower the amount of physical memory being used by your computer. Close any unnecessary programs such as unused Internet browser windows. Close programs running in the background by right-clicking their icon in your taskbar and clicking 'Exit.' Launch your task manager by pressing the 'Ctrl,' 'Alt' and 'Delete' keys simultaneously. Click on unnecessary tasks. Click 'End Task.' Following these steps will free up physical memory, lowering the chance of encountering the error.

Enable Direct3D
1. Click on the “Start” button. If using Windows XP, click on “Run.” If using Windows 7 or Vista, click in the “Search” box.
2. Type “dxdiag” without the quotes and press the “Enter” key.

3. Click on the “Display 1” tab. Ensure that Direct3D is set to “Enabled.” If it's disabled, click in the box next to “Direct3D Acceleration” and select “Enabled.”
4. Click on the “Display 2” tab. Ensure that Direct3D is set to “Enabled' on this tab as well.
Update DirectX
5. Click on “Start,” then on “All Programs.”
6. Click on the “Windows Update” link.
7. Allow the automatic update process to finish while following any on-screen instructions. Restart your computer after the update completes.
Use Microsoft-Certified Video Drivers
8. Click on the “Start” button. If using Windows XP, click on “Run.” If using Windows 7 or Vista, click in the “Search” box.
9. Type 'desk.cpl' without the quotes and press the “Enter” key.
10. Click on the “Adapter” tab.
11. Click on the “Properties” button.
12. Click on the “Driver” tab.
13. Click the “Update Driver” button.
14. Double-click on “Search Automatically” in Windows Vista and 7. In Windows XP, click in the box next to “Yes, this time only,” and click “Next.”Note: This process will attempt to download a Microsoft-certified driver. The driver downloaded may not be the most recent version. However, it is good practice when troubleshooting to download a Microsoft-certified driver to prevent compatibility issues.
Reinstall Your Application
15. Go to “Start,” then “Control Panel.”
16. Click on the “Uninstall a program” link in Windows Vista or 7. Click on the “Add/Remove Programs” icon in XP.
17. Scroll down to the application that is giving the error and double-click to uninstall it.
18. Install your application.

1. Go to the Installshield Web page (see Resources) and download the appropriate fix. Find out the version number of the IsScript engine by right-clicking on the file you are attempting to install and select 'Properties.' Click the 'Version' tab in the dialog and look at the 'Version' section. Download the appropriate fix according to the file version.
2. Click 'Save' in the dialog box and double-click the installation file to install the fix and eliminate the 'Setup Is Unable To Find or Update ISScript.msi' error.

3. Go to the 'C:\Windows\Installer' folder in Explorer and right-click 'Installer' and choose the 'Properties' option. Click the tab entitled 'Security' and make sure the 'System' and 'Administrator' accounts have full permission on the folder. This will ensure that you have permission in the 'Installer' directory.
4. Click the desktop's 'Start' button and click the 'Run' icon. Open the Microsoft registry editor by typing 'regedit' into the 'Run' text box and clicking the 'OK' button. Go to the left-side pane of the editor and double-click the 'HKEY_LOCAL_MACHINE' folder, then double-click 'SOFTWARE.' Go to the 'InstallShield' folder and right-click it. Select the 'Permissions' option and add the 'System' and 'Administrator' accounts by clicking the 'Add' button. Click 'OK' in the dialog.
5. Ensure that all active programs are closed and run Installshield.

1. Save and close all open documents and software programs.
2. Click the 'Start' button and then click 'Control Panel.'

3. Type 'Memory' in the search box and then click 'Diagnose your computer's memory problems.' (Note: Type in your administrator password or provide confirmation, if prompted.)
4. Click 'Restart now and check for problems (recommended).'