My sister downloaded a bunch of horsestuff on it, giving it a bunch of spyware and viruses (like frostwire and limewire, which are complete shams). Because of that, I probably need to buy a new mobo, processor, and memory (and possibly a new HDD).
What
Spyware/viruses/etc aren't transferred to your mobo, processor, or memory. All you've got to do is re-format your hard drive and re-install Windows if you want to do a complete purge.
Otherwise you could also boot into safe mode and run some virus scanners and other stuff to try and get rid of the spyware.
Edit:Woah damn, A new page in under ten minutes?