ctrl/alt/del and look at the Proceses tab. This will tell you what is running in the background.
It's probably something you have looking for on-line updates.
I reformatted my desktop to the original configuration that Compaq sent me and now my screen saver many times won't turn on. When it finally turns on, there is this mystery program that flashes on at the bottom of my start menu and immediately goes away. It does this roughly every 5 minutes and turns my screen saver goes away. How can I find out what this program is that keeps turning running and turn it off? Can anyone please help me?
Compaq Presario S5000NX
Celeron 1.50 ghz
window XP
thanks

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