I recently upgraded my machine with a new motherboard and memory, along with cpu. When I first started the machine, I could barely notice the performance boost. I went from Amd Thoroughbred 1800+ to a Barton XP2500+ with new 1GB Corsair Memory. I have had suspicions about the memory since it is used so quickly. First, is the operating system to blame for the poor performance, or is the memory not configured correctly. I was told by Asus to try reinstalling the Hard drive controller driver, but I don't see how it would affect Window's management of virtual memory. Any help would be greatly appreciated. Thanks.
You can try downloading and running a memory tester. Microsoft has one on there website. As well as there being one on the MAX PC CD a couple of months back.
A good one will force you to create a boot disk and have you scan using the disk. This makes me think it could just be a bit of bad RAM in your computer. We had situations similar to yours at my place of work and ran a system diagnostic tester and found out the problem was bad RAM memory.