Well, that's a hyperthreading processor. If your motherboard is a dual channel unit, those memory sticks aren't going to be performing like they should...you want 2 matched sticks. You're also going to need to cut down on the background processes running (412MB paging file is too big). If you have Norton, McAffee, Trend Micro, or other similar anti-virus programs, get rid of it and use one of the anti-virus programs that has a lot less overhead on the background processes.
Baldy, the only reason there are so many PCI-E x16 cards available is because it's the latest tech...just like everything else, nothing more. AGP ran its course and is obviously old tech, but for the OP here, the best AGP card available is not a completely out of the question upgrade, considering a new system that will last more than a year will cost $700+. The video card in question here is a signficant upgrade from his current model and at a price he can afford immediately. With some further assistance from the knowledge base here, I'm betting he would be good to go for more than another year with the Radeon 4670. The fact that a PCI-E model is half the cost doesn't help him in any way since it would mean putting together another computer.
Easy for people to talk about "saving money" when you have some to save but there are more people living paycheck to paycheck with a family to care for than there are people who have spare money to save. No offense here fellas but, put yourselves in the shoes of the OP's here once in a while...all the "Toms Hardware" info and "a new system would be better" does not address the issue at hand if the OP says they cannot afford the new systems that some have the luxury of buying.