Having problem with graal!!!!

[Matman58]

Ok people if anyone could please help me, that would be great. Ok I am running graal on a computer with a...

Windows XP
AMD Athlon(tm)XP 2100+ Processor
1.74 Ghz
512 MB Ram
128MB GeForce4 Ti 4400 Video Card.
DirectX 9.0
(All Drivers are up-to-date)

From what I understand this stuff should run graal with no problem, but for some reason when I am playing sometime I will just be walking between levels and such and my computer screen will suddenly go blue and show some error msg about memory...and will start counting. And I have to restart every dang time this happens. This problem only happens with graal to. So could anyone help explain to me why its doing that or fix this problem. It just becoming a pain that this problem happens all the time. Oh yea and if it doesn't do the blue screen thing it just suddenly restarts my computer as I am playing.