Windows

Check Errors in the Windows Event Viewer
1. Click 'Start,' right-click 'Computer' and choose 'Manage.'
2. Click the arrow in front of 'Event Viewer,' double-click on the folder 'Windows Logs' and click on the log containing the event you wish to view, such as 'System,' or 'Application.' The 'System' log lists system errors such as driver failure while the 'Application' log lists errors that are caused by programs.

3. Double-click on an Event in the list to view detailed information about the event. Blue screen errors will typically be listed with an event type or level of 'Error.'
Check Errors when they Occur
4. Click 'Start,' type 'sysdm.cpl' into the search field and press 'Enter.' You can also click 'Start,' 'Run,' type 'sysdm.cpl' into the run field and press 'Enter.'
5. Click the 'Advanced' tab and then click 'Settings' under 'Startup and Recovery.'
6. Uncheck the box called 'Automatically restart' and click 'OK.' The next time your computer experiences a blue screen error, it will not restart automatically. This will allow you to check and record all the information on the error screen before turning off the computer and starting it back up manually.

1. Click 'Start' and right-click 'Computer' in the Start menu. Then click 'Manage.'
2. Click 'Disk Management' in the sidebar.

3. Right-click the drive that was originally drive G and click 'Change Drive Letter and Paths.'
4. Click 'Change,' click 'G' in the drop-down box and click 'OK' twice.
5. Open the registry editor by clicking 'Start,' typing 'Regedit' into the search box in the Start menu and pressing 'Enter.'
6. Navigate to the 'HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders' key in the registry editor.
7. Examine each registry entry's path in the 'Data' column and look for paths that start with a 'G:'. For each that does, right-click the value, type the correct drive letter into the 'Value Data' field and click 'OK.' For example, if one path reads 'G:\Documents and Settings\Administrator,' change it to 'C:\Documents and Settings\Administrator.'
8. Navigate to the following registry keys and replace each 'G:' value inside of them with the correct drive letter:HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell FoldersHKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersionHKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell FoldersHKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
9. Close the registry editor and re-run the program's installer.

1. Click 'Start,' 'Programs,' 'Accessories,' 'System Tools' and 'System Restore.'
2. Click 'Restore my computer to an earlier time.'

3. Select a date prior to the point when the registry error manifested.
4. Press 'Next' to restore your computer, fixing the registry error.

1. Download the Userenv.dll file from any free DLL download website (see the 'Resources' section of this article).
2. Right click the downloaded DLL and select 'Copy.' Click the 'Start' menu, select 'Computer,' open the 'C:' drive. Double click the 'Windows' folder and the 'System32' folder. Press the 'Ctrl' and 'V' keys at the same time to paste the file into the folder. Click on 'Yes' in the confirmation pop-up to replace the existing bad DLL (this message will come up only if the DLL is corrupt, but still present in the system.)

3. Go to the 'Start' menu, type 'run' in the 'Start Search' box and press 'Enter.' Type 'Regsvr32 'C:\Windows\System32\msxml3.dll' in the 'Run' window's search field and click 'OK' to register the DLL. Click 'Yes' in the pop-up to confirm the registration.
4. Restart your computer.

1. Close all currently running computer applications by clicking the red 'X' in the upper right-hand corner of the program's window.
2.

Press the 'Start Menu' button and click on the 'Control Panel' option. This will open a new window.

3.

Click on the text field in the upper right-hand corner of the 'Control Panel.' Type 'solution'--this will bring up one or more clickable options; click on the option labeled 'Problem Reports and Solutions.' This will open another new window.
4.

Click on 'See Problems to Check,' located on the upper left-hand side of the 'Problem Reports and Solutions' window.
5.

Scroll the list of recent computer problems to find problems associated with the specific application you're trying to fix. You can view more details about the recent errors for that application by clicking on 'View Details.' Check the boxes for any application errors that you want Windows to automatically fix. If you want to fix all recent program errors, simply click 'Select All' near the top left-hand side of the screen.
6.

Click 'Check for Solutions.' Windows will initiate an automatic search for fixes to the specific application problems you have selected---you must have an active Internet connection for this search to work. Be patient while the search is conducted; depending on the number of errors Windows needs to fix, it may take several minutes to complete. Once Windows has identified solutions to your computer's specific problems, click to install the new fixes for your PC's applications.

1.

Double Click the offending 'Validating Identity' icon in your system tray.
2.

In the Following 'Wireless Network Connection Status' Window click on Properties

3.

In the Resulting 'Wireless Connection Properties' Window click on the 'Wireless Networks Tab.' In this window then click on Properties for your preferred network.
4.

In the next window click on the 'Authentication' tab, Make sure 'Enable IEEE 802.1x....' checkbox is UN-Checked, the rest of this window should be greyed out. If your network is Encrypted go on to step 6 otherwise Click ok and try to connect to your network again.
5.

If you receive a 'Limited or No Connectivity' error for your network connection then your network is most likely encrypted and you need to repeat steps 1-3 and go on to step 6.
6.

In this window make sure you are in the 'Association' tab. You will need to enter your encryption information here in order to connect to your network. Select your encryption type from the 'Network Authentication' and 'Data Encryption' drop downs. Uncheck 'The key is provided for me automatically' and enter and confirm your Network key. Click ok to save changes and try connecting again

1. Run anti-virus and anti-spyware programs on your computer. Follow your software manufacturer's instructions for performing a full system scan. For best results, perform these scans in Windows Safe Mode (Resource 1). Reboot the computer when complete.
2. Look for errors or instability in your system. If your computer runs more smoothly after the virus/spyware scans, you likely eradicated the processes that were hijacking rundll32.exe.

3. Check for the legitimate rundll32.exe file. If you continue to have problems, you must pinpoint which programs are masquerading as rundll32. The real rundll32.exe file is located in C:\Windows\System32\rundll32.exe. Locate this file by performing a search. Click the 'Start' button, then 'Search.' Type 'rundll32' in the search box. In Windows Vista and 7, type 'rundll32' in the run/search box in the 'Start' menu.
4. Copy---but don't move---the legitimate rundll32.exe file from the System32 folder to your desktop. Rename it rundll32COPY.exe.
5. Delete all other rundll32.exe files that were returned in your search. Do not delete the version located in C:\Windows\System32. Empty your Recycle Bin after you have deleted the files.
6. Reboot your computer. In most cases, you should have deleted all malicious versions of rundll32.exe. If you left the legitimate file intact, Windows should function normally. If you deleted it by mistake, copy the backup version from your desktop back into the System32 folder and rename it rundll32.exe.

Enabling ActiveX
1. Launch your Internet Explorer web browser and click the 'Tools' button.
2. Scroll down and click 'Internet Options.' Click the 'Security' tab and click 'Custom Level.'

3. Click 'Prompt' under 'Download signed ActiveX controls.' Click 'Enable' under 'Run ActiveX controls and plug-ins.' Click 'Enable' under 'Script ActiveX controls marked safe for scripting.'
4. Click 'OK' to save the changes and 'OK' again to close the Internet Options.
Solving ActiveX Registry Errors
5. Download and install CCleaner free (see Resources).
6. Launch your program after it has installed and click the 'Registry' button on the left panel.
7. Place a check on 'ActiveX and Class Issues' and click 'Scan for Issues.' When the scan is complete, click 'Fix selected issues.' Click 'Yes' to back up and save your registry.
8. Click 'Fix all Selected Issues' and click 'OK' to repair the ActiveX errors and problems.
Uninstalling and Reinstalling ActiveX Application
9. Click the Windows 'Start' button and click the 'Control Panel.'
10. Double-click 'Add or Remove Programs' to open the applications and programs window.
11. Scroll through and click your downloaded ActiveX application. Click 'Change/Remove' and click 'Yes' to remove it from your computer.
12. Navigate to the website to which you downloaded the ActiveX application to reinstall it on your computer.

1. Check the format of the file you are trying to play. While common file types like MP3, MP4 and WMA are all supported by the Windows Media Player, less common or propriety file types like RM or M4A are not supported and will cause an error message to pop up.
2. Update your Windows Media Player/Operating System. Like any program, the Windows Media Player is constantly being updated to improve efficiency, compatibility and aesthetics. Make sure your computer is set to automatically download updates to the operating system (check the Control Panel's 'Security Center' to find this option). To update the media center itself, simply open the program (while connected to the Internet) and Windows Media Center will automatically check for updates. Alternately, you can check the Windows Media Center website (See Resources) for updates.

3. Check file path. If you receive a 'file not found' error message, check the file path. If you are using an old shortcut, the file may have been moved or deleted. Try finding the file you wish to open on your hard drive and open it directly to get rid of the error message.
4. Close other programs. Windows Media Player requires a lot of memory to run, and if you have a lot of other programs open while you are using Windows Media Player, you may receive a 'critical error' or 'lack of memory' error message. To combat this, close other resource-consuming programs, like Internet browsers.
5. Delete unauthorized add-ons. If you have downloaded unauthorized codecs or skins, they may also be causing Windows Media Player to generate errors. Delete these add-ons to restore functionality.

1. Shut down all currently running applications and restart your computer. Press 'F8' repeatedly before Windows begins to open the Windows Advanced Options Menu.
2. Scroll down and select 'Safe Mode.' Press 'Enter' to log into Windows Safe Mode. Safe Mode is used for troubleshooting and repairing system components.

3. Click the Windows 'Start' button and select the 'Control Panel.' Double-click 'Add or Remove Programs' to open the programs window. Click 'Program and Features' (Windows Vista users) and select 'Uninstall a Program' to open the programs window.
4. Click the incompatible software (e.g., Palm Desktop and Synchronization Software) and select 'Change/Remove.' Click 'Yes' to confirm and uninstall the program from your computer.
5. Restart your computer normally to complete the process.