Have a problem, cant login to windows

Last night my girlfriend thinks she may have picked up some malware / virues .

She said it was trying to direct her to http://anykuy.com

So she turned off her pc to wait for me to get round.

Now when i turn on th epc it boots into windows to the enterpass word screen, when you put in the password it starts to log into her profile ( there is only hers and the hidden admin acct ) but as soon as it starts to login to the profile , it then immidatly logs back out to the password screen.

Now this happens exactly the same if i try and boot in , in safe mode and into either her or the admin account. it just logs you straight back out.?

Now im not really sure how im meant to do anything if i cant get into windows.

Any ideas ?

 

Thanks for you reply .

Yes it is XP , but its a copy that came with the comp when she bought it from tiny :s , so its not just the normal copy of windows.

In the link you posted it starts lol ....

" Do not use the procedure that is described in this article if your computer has an OEM-installed operating system "

Does that mean the kind of copy she has ?

If so is there any other way of doing it ? i believe she has an old backup of her registry in her documents from when she installed spybot search and destroy. Would there be a way of restoring the registry from the backup, without being able to login to windows as i previously described.


And thanks again for any help you are able to give