I get this message from McAfee Virus scan:
"Trojan Found: The file C:\WINDOWS\system32\xlib254.dll is infected by Generic Downloader.bt trojan cannot be cleaned"
I tried to quarantine, delete and it tells me to make sure it's not right protected. I did a scan in Safe Mode, and it still didn't allow me to delete it.
The above is the only reference found by googling.
Suggest you do a scan with the two programs below and let us know what was found.
Install Super Antispyware. Run it in safe mode. Allow it to quarantine whatever it finds. http://www.superantispyware.com/
Run the online scan for Bit Defender in normal mode. Allow it to quarantine whatever it finds.http://www.bitdefender.com/scan8/ie.html