lots of system lag, need advice

[lacky]

I have a less than year old Dell Dimension 8400 pentium 4 3ghz, 2 gig ram.

When I run pokertracker, playerveiw, and 8 to 12 tables i get lag, and the processer is maxed out at 100% most of the time. I added a raptor drive and moved all the pt databases onto it, and added 1 gig of ram to bring it up to the 2 it has now.

edit-Forgot to mention I have tons of data, TONS, which is the problem, but I still need a solution that doesnt involve getting rid of the data!

I have no problem buying a new system if neccesary, but I need to figure this out. As far as other programs running, i generally have AIM on, and norton antivirous and microsoft antispyware run in the background that I know of.
But, as I right this I have a notepad open and this browser and it shows 50 processes running, but zero cpu usage and commit charge: 378m/4966m, if any of that helps.

Any tips or ideas or even past posts that I'm not finding that I can search for are all welcome.

Steve