You have a couple options to try...
1) Go into SAFE MODE by pressing F8 when you power up the system.
- from the RUN dialog box type the following to start the SYSTEM RESTORE :
c:\windows\system\restore\rstrui.exe
as per KB279736 (
http://support.microsoft.com/kb/279736)
2) You can follow the steps from KB307545 . You don't need to have the
Windows XP cd, you can use a Windows 2000 or 2003 cd to get to the recovery
console. If you don't have access to any of those, you can try to create a
bootable cd from -->
http://www.nu2.nu/pebuilder/
[How to recover from a corrupted registry that prevents Windows XP from
starting]
http://support.microsoft.com/kb/307545
I hope this helps.
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Craig
Microsoft Setup Team
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