Unless the scanning caused the drive to overheat, and fuck the head's, there's no way it will wipe it.

However,

What you should of done is boot of the windows xp cd, go thorugh the process of installing windows, but instead of doing an install, repair the current installation and, with a bit of luck, it would be fine.

The mere fact alone it gave you the windows xp startup menu proves there is an operating system on there.

I thought you was quite clue'd up on puters