My computer has a mind of its own - Strange problem

[PeterDragon]

I should just buy a new computer, right?

not necessarily - it depends what you want to do with it. You can probably do fine for most things, although it probably was a mistake to put XP on it.

Try the bios thing, then if need be try and re-install windows (without formatting). If all else fails you can do the backup / format / reinstall thing.