Crashing XP during online games

Hi

During online games, primarily Soldier of Fortune 2 sometimes, after about 40 minutes my system crashes. Upon restart I send the serious error report to Microsoft and all they say is it was caused by an unknown device driver.

Before I upgraded my device drivers to XP for my soundcard, I at least was getting a blue screen and the message 'Driver_IRQL-not_less_or _equal', which a mate suggested to me that I increase my I/O operations value, which I did and also to check my IRQ in device manager, which I did and their where no conflicts.

Now, since installing the XP drivers for my soundcard I dont even get that blue screen which might give me a clue, just the error report on reboot.

The only thing I can think of to do now is to move my soundcard to a different slot, so does anyone have any ideas please. Any help would be gratefully received but please answers in simpletons language please. Cheers.

Thanks for your replies in advance.

My system:

MSI K7N2 Delta ILSR M/board
Athlon XP 2.4 Processor
Geforce 4 Ti 4600 Platinum graphics card
Creative Labs Soundblaster 1024 sound card
512 DDRam
BT Voyager 100 USB ADSL Modem
Win XP Home edition
100 GB hard drive memory (20 master/80 slave)
400w PSU
DVD player
LG CD Re-writer
Floppy Disc Drive

All drivers are up to date so I believe.