Well I went over to my friends house to fix up his computer a little as it was crawling with viruses, so I was able to pretty much get rid of everything. But for some reason after a couple of reboots and working on it, every time I would logon to any account on the computer it would instantly log me back off. This is on Windows XP.

Hi --welcome to PCHF--
If it was that loaded with junk... I would suggest that you boot into "safe mode" ...
and run a full antivirus scan .
Then if you can get back into normal boot-- you should come back here-- and follow the Prework instructions from the link below.
Then post a HiJack This log in the HJT logs forum for analysis.
There are many bugs that can hide from regular AV software.