Thanks for the reply. I don't remember seeing it but it's plain that you made the response the same day I posted it.
What I did was take another MB that I had, bought a used Core2 Duo (and was given the DDR2 that I needed for it, bought a video card and have used it with Win7 for the eight months since. However, I've gotten memory errors on a regular basis and memory tests show no problems with the memory so I'm looking to get a new MB and new processor.
I multitask ferociously but don't game. Any suggestions? I wouldn't pay $300 for a processor unless it blew everything else out of the water. For incremental improvements, I'd rather go down "incrementally" to a processor under $200 (I'd really like to pay $100 and upgrade in three years). I do want USB3 and minimum of four cores and the fastest FSB without spending too much.