Windows

Method 1: If You Are Able to Run Windows
1. With Windows running, insert the Windows CD or OEM recovery CD into your optical drive.
2. Click the 'Start' button, and then select 'Run.'

3. Type the following command in the 'Run' box (X is the letter of your CD/DVD drive; check your system to find the proper drive number):expand X:\i386\rundll32.ex_ c:\windows\system32\rundll32.exe
4. Reboot the computer. Your corrupted rundll32.exe file has been replaced with the original.
Method 2: If You Are Unable to Run Windows
5. Insert the Windows CD in your computer's optical drive. Reboot the computer.
6. Upon restart, you may be prompted to 'Press any key to boot from CD/DVD.' Follow these instructions to boot from the Windows CD.
7. You will see a 'Welcome to Setup' screen, which presents you with a few options: 'To setup Windows XP now, press ENTER,' and 'To repair a Windows XP installation using Recovery Console, press R.' Even though you are performing a repair installation, do NOT press 'R.' Press 'Enter.'
8. Select the Windows installation you want to repair from the list that appears. Look for C:\WINDOWS 'Microsoft Windows ...'. Then press 'R' to enter repair mode. Press 'F8' to accept the Windows licensing agreement.
9. Windows will reinstall the operating system, overwriting your corrupt or missing rundll32.exe file. Your other data and files will not be erased.

1. Restart your computer to launch the 'Setup' menu.
2. Press 'F7' when you see the following prompt: 'Press F6 if you need to install a third-party SCSI or RAID driver.' This will disable the current ACPI HAL installation.

3. Let Windows install the Standard PC HAL. This process may take a few minutes to complete. Once completed, you will be able to install Windows 2000 with no error messages.

1. Download and install the Windows Installer CleanUp software. This software will get rid of the files corrupting your copy of Microsoft Office. See the 'Resources' section for a download link.
2. Launch the software from the Start menu and select 'Microsoft Office 2003' from the list of programs and then click 'Remove.' The Microsoft Office 2003 software will be completely removed, including all corrupted or lingering install files.

3. Restart your computer and then insert the Microsoft Office 2003 CD. Run the installation program.
4. Restart your computer again and then reinstall the patches.

Windows XP
1. Press the 'Windows' and 'R' keys simultaneously.
2. Type 'Regedit' and press 'Enter.'

3. Navigate to 'HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PcHealth\ErrorReporting'.
4. Right-click 'DoReport' and select 'Modify.'
5. Change the value from '1' to '0' and restart your computer.
Windows Vista / 7:
6. Press the 'Windows' key and 'R' key simultaneously.
7. Type 'Regedit' and press 'Enter.'
8. Navigate to 'Hkey_users\S-1-5-19\Software\Microsoft\Windows\Windows Error Reporting'
9. Right-click 'Disabled' and change the value from '0' to '1'.
10. Restart your computer.

1. Click 'Start' and then 'Computer.' Right-click 'C' and select 'Properties.'
2. Select the 'Tools' tab and click 'Check now.' Select 'Continue' if the User Account Control prompt displays.

3. Select the 'Automatically Fix File System Errors' option and click 'Start.' Agree to reschedule the check for the next system restart.
4. Reboot your system. Allow the check disk to detect and repair all Error 301 issues.

1. Close programs you aren't using if they are running in the background. You'll immediately free up enough space to save your files. Windows tasks your hard drive when you have programs running or multiple windows open. If this method does not work, attempt a save to an external drive.
2. Turn off your antivirus program and check whether your hard drive space increases. Most antivirus programs take up ample drive space, or they can negatively affect a computer's performance while updating. To see how much space your program uses, open your Control Panel. Acess your 'Add/Remove Programs' category and review the list of programs. Each program name includes the amount of allocated hard drive disk space. If the program is hogging your drive, consider purchasing an antivirus product, such as AVG, that utilizes less space.

3. Remove any spyware or adware by downloading removal software for free from a reputable website such as CastleCops. Use the 'Hijack This' application to create a snapshot of your system files for review by a technician. The pro will tell you how to hunt and remove any harmful files.
4. Empty your Recycle Bin. Remove programs and delete files that you no longer use, including temporary files and Internet cookies. Remove programs in the 'Add/Remove Programs' list.
5. Use ScanDisk to locate and fix any hard drive errors. If you cannot find ScanDisk, run a search from your Windows Help screen.
6. Defragment your hard drive. Defragmenting frees up hard drive disk space by bringing all of your data together in one place on the hard drive.
7. Buy a bigger internal or external hard drive if all else fails. Many inexpensive internal hard drives are available and are easy to swap. Match the new internal hard drive physical size to the existing one, so that it fits in your hard drive dock. Check your manufacturer's list of recommended drives. Most inexpensive external hard drives attach easily to computers with USB connectors.

Fixing with Anti-Virus
1. Shut down the computer.
2. Restart the computer, but press F8 repeatedly to bring up a menu asking how you'd like to boot the computer. Select 'Safe Mode.'

3. Open the anti-virus software on your computer. If you don't currently have one, you can download a free one from the link provided below (see Resources).
4. Perform a full system scan. Being in safe mode will allow the scan to detect and remove more infected objects.
5. Click 'Remove' once the scan is complete.
Fixing the Registry
6. Download the RegCure software through the second link in Resources. This software will scan the computer for all possible registry errors and issues.
7. Double-click the RegCure download icon, then follow the steps to complete the installation.
8. Open RegCure by double-clicking the new desktop icon.
9. Click 'Scan', leaving all of the scan options selected.
10. Click 'Remove' once the scan is complete. Once this step had been performed, there should no longer be any more lsass.exe system errors

1. Place the Mac OS X Install DVD into your computer and select 'Restart' from the Apple menu. Hold down the 'C' key on the keyboard when you hear the chime.
2. Click 'Continue' until you get to the menu screen. Select 'Utilities' or 'Disk Utility' from the menu.

3. Select your Mac's hard drive and start-up disk. Hold down the 'Command' key to select more than one disk.
4. Click 'Repair Disk.'

WinRar Installation
1. Go to the WinRAR website and click on 'Save File' in the automated pop-up to accept the WinRar setup file download.
2. Double-click the saved file and click on 'Yes' to confirm execution.

3. Follow the step-by-step instructions of the Installation Wizard to install the WinRar archiver to your PC.
Registry Fix Installation
4. Go to the Registry Fix Installation website, and click on 'Download WindowsLicense.rar' icon on top of the page.
5. Click on 'Save File' in the pop-up window to accept the RAR file download.
6. Double-click the archived file once the download is complete, which will automatically launch WinRar and decompress the file. Decompression will result in a new folder with several files inside.
7. Double-click the folder and then the file with .reg extension, which is the registry fix. Click on 'Yes' in the pop-up window to confirm installation.
8. Restart your computer. The WGA notification should be gone, and your operating system will pass all of the future validation tests.

1. Click the Windows 'Start' button, type 'regedit' in the Search field and point to 'regedit.exe.'
2. Press 'Ctrl-Shift-Enter' to launch the Registry Editor with administrative credentials.

3. Navigate through 'HKEY_LOCAL_MACHINE | SYSTEM | CurrentControlSet | Control | Class | {4D36E965-E325-11CE-BFC1-08002BE10318}.'
4. Right-click 'LowerFilters' from the right pane and select 'Delete' from the context menu.
5. Click 'Yes,' when prompted, to remove the value from the registry. Right-click 'UpperFilters.'
6. Click 'Delete' and select 'Yes' to remove the value. Restart the computer to resolve the error code.