Yes, I meant the virtual memory. If I read your specs right, you have 512 Mb of RAM, which really isn't much if you're running Poser 5 and XP.

Maybe you'd be better off if you just bought a new computer next time, instead of replacing parts. Or at least a new case. I have a feeling older cases/fans may not be able to handle the heat generated by new processors, etc. I know when I bought my last computer, I was astonished at how powerful the fans were. I could feel the breeze, even with the case closed. Which wasn't the case with my previous computer.