Windows

1. Restart your computer and press the “F8” key on your keyboard before Windows starts up.
2. Press the “down” arrow key on your keyboard to highlight the “Safe Mode” option. Press the “Enter” key on your keyboard.

3. Select your computer with the arrow keys and then press the “Enter” key. Your computer will then start in Safe mode and you’ll be prompted to log in as a local administrator.
4. Click on the “Start” button, then click “Run.” Enter “cmd.exe” into the “Open” field and then click on the “Open” button.
5. Enter “msiexec /unregister” into the command prompt and press the “Enter” key. Enter “msiexec /regserver” into the command prompt and press the “Enter” key.
6. Type “exit” into the command prompt and press the “Enter” key. The Error 1721 will be fixed and you can remove programs using the 'Add or Remove Programs' feature.

Error 421
1. Access and run the Microsoft Exchange Server Administrator utility. The process used to set up the server will cause the access path to the utility to vary.
2. Locate the 'Connections' icon in the Microsoft Exchange Server Administrator’s left navigation pane. This is for the server that you want to administer. Find the 'Internet Mail Service' icon in the right navigation pane and double click it to open the 'Properties' dialog box.

3. Click the 'Connections' tab, then click the 'Advanced' button. The configuration dialog will open up.
4. Move the number in the 'Max No. of Inbound Connections' higher, until the error is rectified. For example, begin with 100 and if this does not solve the error, continue to go higher until the error is fixed.
5. Close the program dialog boxes to save recent changes.
Error 0X800ccc90/Error 0x800ccc18
6. Open and run Outlook Express and click on the 'Tools' option in the main menu.
7. Choose the 'Accounts' option under the 'Tools' menu.
8. Click on your email account to select it and choose the 'Log on using' option.
9. Click on 'Servers' in the 'Log on using' menu. Select the 'Clear Text' option to rectify this error. You can now log on without any issues.

1. Login as Administrator to Windows. You can also login with any username that has computer admin privileges.
2. Click 'Start' and then 'Run.' Execute these strings in the 'Run' box: 'regsvr32 /i %windir%\srchasst\srchui.dll' (without the parentheses) and then 'regsvr32 %windir%\system32\jscript.dll' again without parentheses. You should see the message 'DllRegisterServer in
succeeded for each DLL registered, so two in total.

3. Log off and then log back on, and check the Search Companion window to ensure that it is now working correctly and isn't displaying blank. If it's still blank, you'll need to repair the search components using a specific Windows INF file.
4. Click 'Start' then 'Run.' Type '%systemroot%\inf' and then click 'OK.' Don't include the parentheses in the string. Now a window will open. In the window, locate the file named 'srchasst.inf,' right-click it, and choose 'Install.' You'll now be prompted to insert the Windows XP CD, so do so and point to the i386 folder on the CD. If you installed Windows XP Service Pack 1,2, or 3 separately after installing Windows XP, point to '%windir%\ServicePackFiles\i386' instead. Search Companion is now reinstalled and should operate correctly.

1. Click 'Start' and select 'Control Panel.' Click 'System and Security' in Windows 7 or 'System and Maintenance' in Vista.
2. Click on 'System' and select 'Advanced system settings' in the left-hand column. Select the 'Advanced' tab and then click on 'Settings' under the 'Performance' section. Select the 'Advanced' tab and click the 'Change' button in the 'Virtual memory' section.

3. Click to remove the check mark next to 'Automatically manage paging file size for all drives.' Click to highlight the drive that you want to change, which is typically the 'C' drive.
4. Click the radio button next to 'Custom size.' Type the new minimum amount for virtual memory in the 'Initial size' field. This should be 300 megabytes more than the amount of RAM in your computer.
5. Type the new maximum amount for virtual memory in the 'Maximum size' field, which should be three times the amount of memory in the system. Click the 'Set' button and click on 'OK.'

1. Start Windows in Safe Mode. Reboot the computer and begin tapping the 'F8' key until the 'Windows Advanced Options' menu appears. Select 'Safe Mode No Networking' and press 'Enter.'
2. Run any antivirus software you have installed on your computer, followed by antispyware software. Ideally, you should have at least two antispyware programs, as some malicious items are detected by some products but not others.

3. Delete any viruses or spyware your software detected. Reboot. If the error messages disappear, you do not need to proceed further.
4. If the rundll32.exe problem persists, your Windows rundll32.exe file is corrupt. You must perform a Windows Repair Installation.
5. Repair Windows. Reboot the computer with the Windows CD in the CD drive. When prompted, press any key on the keyboard to boot from the CD.
6. Wait for the 'Welcome to Setup' screen, which contains a list of options. Press 'Enter' to select 'Setup Windows XP.' Do not press 'R.'
7. Select the Windows installation you want to repair from the list (C:\WINDOWS 'Microsoft Windows ...'). Press 'R' to enter repair mode and 'F8' to accept the Microsoft licensing agreement.
8. Windows will reinstall the operating system, including the corrupt rundll32.exe file. Your data and other files will not be affected.

1. Open the 'Start' menu.
2. Navigate to 'All Programs,' then 'Accessories,' and finally 'System Tools.'

3. Click on 'System Restore.' This will open the System Restore program.
4. Select 'Restore my computer to an earlier time, and click 'Next.'
5. Find a restore point on a date that fell before the Win32api.dll error began.Select it, and click 'Next.'
6. Click 'Next' again. The process will begin and your computer will restart.

1. There are many ways to repair your registry: from System Restore, to your installation disk. There are also many Registry Cleaners on the Internet that will do this specific task for you.
2. Unfortunately, if you do a Google search for a Registry Cleaner, the first pages are filled with Registry Cleaners that toot they are free, but scam you into buying them after a quick scan of your registry.These programs will show you how many errors there are in your registry and will offer to repair the first 3 or 4 errors. That isn't going to help you.

3. There are a few legitimate FREE registry cleaners. One that is definitely for free is the Eusing Free Registry Cleaner.
4. Go to the Eusing website (in resources). Click on the download tab or any of the Mirror sites. Once it downloads, click Run and install the program. Once the program opens it will ask for a registration code for a donation.If you observe carefully, there is a SKIP tab. If you want to donate you can. If you don't want to donate and get this application for FREE, just click SKIP.
5. Click the blue letters 'Scan your registry' and wait until the scan completes. It will show you anywhere from a few to hundreds of errors. Click 'Repair Registry'. That's it!

Restart Windows
1. Restart your PC.
2. Load the operating system.

3. Reinstall the upgrade of the .NET Framework. You will no longer get the 1935 error message, the cause of which is removed after a restart.
Stop Windows Installer
4. Open the Control Panel.
5. Double-click 'Administrative Tools.'
6. Double-click 'Services.'
7. Right-click 'Windows Installer.'
8. Click 'Stop.' Now you won't receive the 1935 error when you upgrade the .NET Framework.

1. Double-click 'Computer' on your desktop. Right-click the 'C:' drive and select 'Properties.'
2. Open the 'Tools' tab.

3. Click 'Check Now...' beneath the 'Error Checking' header.
4. Place a check on 'Automatically fix file system errors' and 'Scan for and attempt recovery of bad sectors.'
5. Click 'Start.' You are prompted to restart the computer to begin the Chkdsk scan.

1. Click 'Start' from the System Tray located at the bottom of the desktop, and select 'Control Panel' from the Start Menu.
2. Click the 'Administrative Tools' icon from the Control Panel.

3. Click 'Event Viewer' from the Administrative Tools Window.
4. Click the 'Applications and Services Logs' from the left navigation pane.
5. Click 'Internet Explorer' from within the Applications and Services Logs folder.
6. A list of log errors is listed in the center pane of the Event Viewer.