Computer randomly slowing down

I went camping for two days, and the minute before I left for camp my computer was running completely normal. I come back and my computer is ridiculously slow. It just happened out of nowhere, and my other computer, which happens to be on the same router, is a little slow. It seems to me that this must be something more than a natural slowdown... like my computer has been attacked. I ran a virus scan and all that was found was some trojans which are now gone. I ran a spyware scan and 3 spyware clients were found which are now gone. Also, by coincidence, my hard-drive is now down to roughly 1 gig of memory.

What I'd like to know is:

1) Does this sound like my computer has been attacked?

2) Do you think it could have anything to do with my HDD's low memory?

All responses are greatly appreciated.

 

Could be virus that keeps on X itself. What AV do you have?
download :http://vil.nai.com/vil/stinger/. Run your AV under Safe Mode. also download
http://www.download.com/3000-2144-10122137.html

 

ok, ur biggest problem is because ur running MS windows.