PC Freezes all the time

I'm all out of options and I am looking to the pro's for help. I have XP Pro running on a P4 2.8Ghz with 1GB of Ram. I had a bad virus/spyware to a point where my USB ports and optical devices were not being recognized, so I reloaded windows (fresh new install).

I've updated all my drivers, loaded sp2, sp3, etc. Now my problem is that my pc freezes all the time. I threw some parts at it thinking it was memory or the hard drive, but that didn't solve the problem.

Any idea's? I'm all out...
 
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