Dear Sir/Madam,
The symptom you describe has many possible causes. Here are some
recommendations:
1. You may have a corrupt profile: try logging in with a different user
name/password combination (for example, the Administrator account).
2. If you are logging into a domain, try logging on locally.
3. If you changed out or added new hardware, particularly a drive, your
drive letter for the OS drive may have changed. See the following KB
Article for details on this and steps to remedy:
249321 Unable to Log on if the Boot Partition Drive Letter Has Changed
http://support.microsoft.com/?id=249321
4. You may have a problem with MSGina.dll. See this KB Artlcle and
associated whitepaper:
810756 White Paper: The Essentials of Replacing Msgina.dll
http://support.microsoft.com/?id=810756
5. Try booting the system using Safe Mode:
315222 A Description of the Safe Mode Boot Options in Windows XP
http://support.microsoft.com/?id=315222
316434 HOW TO: Perform Advanced Clean-Boot Troubleshooting in Windows XP
http://support.microsoft.com/?id=316434
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This posting is provided "AS IS" with no warranties, and confers no rights.
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Paul Hayes, MCSE
Microsoft PSS
(e-mail address removed)
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