I have recently been given a Compaq Presario, which is running XP media center.

It was given to me because of problems which the previous owner gave up on and bought a macbook.

In adding and running Spybot S&D it found some 135 problems which I asked it to then fix all.

It could not fix some problems and asked me to restart.

upon restart each time it would find 6 or so problems and only be able to fix 4 'without a restart'.

I watched Spybot run because I found it odd there were so many files 917655.

toward the end of the scans large numbers of files are called virtumonde.sdn.
I looked it up on wiki and it comes up a virus.

I'm not sure how to proceed.