Virus Report When Updating Windows Vista

I am running Windows Vista Home Premium x64 and Bitdefender AV 2009 for a while now!

Untill today everything was working just fine!

But today I was trying to check if there are new updates available for windows and other Microsoft products such as Office 2003.

But as soon as i pressed the button "Check for Updates" inside Windows Update it gives me the error: "Cant check for updates" error code: 8024402F

At that very same moment a Bitdefender Virus Warning pops up saying that a virus on my computer has bee blocked.

Virusname: Virus and location: UNKNOWN

Does anybody know what to do about this problem! Since I am no longer able to keep my windows up-to-date.

Kind regards,

mvleus