Please delete your temporary files. Double Click My Computer (WinXP: Navigate to Start --->My Computer)
You will see an icon representing your harddrive (most likely C: Drive) Right Click on the hard drive icon and click Properties
bottom of the fly out window. One the very first tab (General) you will see a button labeled "Disk Cleanup"...click that button.
Make sure the following are checked:Downloaded Program Files
Temporary Internet Files and
and Disk Cleanup will delete those files for you.
Let us take a closer look at what is running on your PC. We'll need you to use a free diagnostic tool (HiJackThis) and post a log as a new topic in the Hijack This forum
. It will get a better response there from the people most qualified to analyze logs.
Click the HijackThis Guide
in my signature, download it and follow the instructions in the guide. Also see this post
Most of what it lists will be harmless or even essential, DO NOT delete or modify anything yet! Someone will be along to tell you what steps to take after you post the contents of the scan results.