Party makes my computer sooooo slow!

[GLmaestro]

Hi

I recently bought a new computer, with the following setup:

Intel P4 650 3,4 ghz
1 gig DDR2 RAM
Radeon X1300 video card

I run WinXP btw.

Now to the problem: When I play poker I mostly play 10 tables on my two monitors. I have several programs running simoultaneously:

Poker Tracker (Auto importing every 3 minutes, edit: I use Access database)
Poker Ace Hud
Autoresizer
Adde's NL Autoreload AHK script
Allsnap
Skype

Sometimes everything runs smoothly to start with, but after a while the tables open up slower and my mouse cursor responds more slowly than usual.
Other times this happens right at the moment when I start playing.

My CPU usage is between 55-80% when this happens, this can't be normal? I've read some posts that say this problem disappears when shutting down and reopening the PP client, but for me this does not work, I still have the slowness of my mouse etc.

Please guys help me, this is extremely annoying. Give me som advice of what to do (buy more RAM or whatever).

Thanks