Recover Your Windows XP Administrator Password With The Installation Disk

http://www.makeuseof.com/tag/recover-your-windows-xp-administrator-password-with-the-installation-disk/#more-28257

Installing the Recovery Console

http://www.petri.co.il/install_windows_2000_xp_2003_recovery_console.htm

Virus scanning recommendations for computers that are running Windows Server 2003, Windows 2000, or Windows XP

http://support.microsoft.com/kb/822158

Turn off Balloon Tips

http://www.amset.info/windows/winxp-quikies.asp#Turn%20off%20Balloon%20Tips

Restore the Show Desktop icon to Quick Launch bar

Using the Regsvr32 command

Click Start, Run and type the following command:

regsvr32 /n /i:U shell32.dll

How to recover from a corrupted registry that prevents Windows XP from starting

http://support.microsoft.com/kb/307545