Using the Microsoft AntiSpyware program
might help, it will list all running processes
and explain what they are.
Also alternatives such as ‘ad aware’
from http://www.lavasoft.de/ is quite good.
Other useful tools are
Startup Monitor and
Startup Control Panel
from http://www.mlin.net/
And Firefox
from http://www.spreadfirefox.com/
is useful :)