Question : Cannot logon to Windows XP

We have a user with a Windows XP machine.  When he tries to logon ...he gets an error message that is telling him that there are insufficient system resources to log him on.  Then another message pops up and says that A copy of Windows must be activated with Microsoft before you can log on.  Do you want to activate Windows now?

When you click yes or no...it goes back to the CTRL-ALT-DEL screen.  Can't logon with a domain or local user to this machine...just a continual loop.  Any ideas?

Thanks!

Answer : Cannot logon to Windows XP

Try accepted solution.
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Windows/XP/Q_24543911.html

You may also have a virus on machine causing log off issue.
If so check this key using boot cd like Ubcd4Win

Boot to Ubcd4win and run its regedit app
http://www.ubcd4win.com/

Browse to this key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

Value Name>  userinit

Value Data of userinit should be all of the following:

C:\WINDOWS\system32\userinit.exe,