For Xp :
click on Start - Run - type "msconfig" - click on the "Startup" tab
For Vista/Win 7:
Click start - start search - and type "msconfig"
See what programs are checked. If you're not sure what a program is, google the "Startup Item" name. You can find out the icon and the process running. And if you find any malicious programs try to uncheck that and restart the computer to check whether the ico nstill displays.