This has a pagefile.pif file cannot be detected by Bitdefender.
When it infect in your computer, it infects some files and serveral install packages.
After Ghost up Windows, run Bitdefender to scan the whole system again, some viruses are detected. Howerver, some still exists and survives in some install packages (like Microsoft Office setup, etc)
After scanning finished and do deleteting all detected viruses, I reinstall Microsoft Office, suddenly Bitdefender detect this virus again and says somethings like : "multiple viruses detected ..." then computer is infected, Bitdefender crashes ! and can not be started again.

It's very strange !

I will try to upload this pagefile.pif later.

Thanks.

Maybe the setups of you programs are already altered

Please post here a HijackThis log

Instructions: http://forum.bitdefender.com/index.php?showtopic=5668

Please upload some samples, including lsass.exe, which should be located in c:\Windows\System32, archived, with the password infected. Further advices will be given afterwars.

Regards!

Here it is

Win32.Xorer. Thank you for the sample.