Multitasking problem with e6600 set up

[Eternalsin]

Here is my system spec, my settings are all on stock setting at the moment in bios.

P5W DH Deluxe Bios 1503
Intel 6600
Corsair XMS2 pc2-6400 5-5-5-12
ATi x1900xtx
Seagate Baracuda 320gb x2
Seasonic 600w

I have a very weird problem and I don't know if anyone has this problem. I can only use 1 program at a time, I can't open multiple programs, this problem only occurs after 2 or 3 hours, and my bios is set to default. I can open multiple programs and multitask with ease for the first couple hours with no problems, the system works fine and great. But after a couple hours, when I try opening multi applications and multitask the applications won't open up at all, it will crash the application or the pc will hang. It will only up up one application at a time and I have to close applications to remove the hang and application crash. I work mainly in programs such as Illustrator, Photoshop, After Effects, Maya and this is pretty frustrating. I have download the Windows XP Hotfix Patch: KB896256 and it doesn't help at all. Any help would be appreciated thanks.

 

[marulee]

Did you check what OS 'service's were running when you are having this issue?
How? Alt-Del-Ctrl then check what are the status!!

 

[Eternalsin]

I turn off virtual memory and my system is finally running smooth without problems. My system has been running for 6 hours and I have over 10 applications open and it hasn't crash, usually it crash on the second application... I don't know why virtual memory was causing me these problems. Which is interesting...