EDIT: PROBLEM SOLVED!
I have a motherboard that is capable of Dual-Channel memory. I upgraded my PC last year, and I added 1gb corsair 3200 400Mhz memory. This year I decided I wanted to make use of the DUal-channel feature so I bought an identical memory.
Installed it last night, booted the computer, and noticed my computer had significantly slowed down. Every time I open IE or any window, it flickers and opens slowly (as in it "wipes" it on the screen, suggesting its slow). Everything is slow, doesn't make sense. BIOS says 2GB Dual Channel, windows says 2GB. No problem in detection.
But then, I tried different things, took the old one out let the new one in, and took the new one out and put back the old one in and it STILL is slowing even if I take out the new one! so what's happening guys?
Please help, thanks a lot