try running a pcpitstop test (
www.pcpitstop.com ) as well, when the test is done it will give you a list of all the programs in start up and colorize them accordingly to:
REQUIRED
Virus/adware
Optional
Unknown
etc, etc
If it's a virus/adware you will most likely need a tool/s like adaware or spybot to remove them and obviously run a virus scan immediatly.
If running XP it's easiest to goto the run command and type msconfig and edit from there, after that you may want to go into the registry and clean everything up if you so choose.
Good luck!