we can better help you if you go to Start > Run and type in msconfig ... go to the startup tab... tells us whats under the startup items column
Be careful with this kid... you may stop something from starting up that is vital to making you machine run...
My suggestion, save anything you want to keep file wise on a blank CD or if you need to store it for a day on something I have some server space...
And then reformat and start over and dont download a lot of crap...
If you don't want to do that find a start up manager or I can look for one for you...
But nothing will work like reformatting...