blue screen appears and pc restarts

hi, this problem is annoying me for the past 1 month ... whenever i play games like nfs most wanted u2 or ea cricket 07 etc... a blue screen appears and my pc restarts .... this also happens sometimes when i watch movies

my specification is :
1. processor Intel core2 duo -E6320 . 1.86 Ghz ,4mb l2 cache,1066 Mhz fsb
2. motherboard - intel D946GZIS
3. Ram - jetram(transcend) - 1 gb ...16 chips (8 on each side )


it happens both in vista professional as well as in xp sp2.



the error report is :

Problem Event Name: BlueScreen
OS Version: 6.0.6000.2.0.0.256.6
Locale ID: 16393

Additional information about the problem:
BCCode: 1000008e
BCP1: C0000005
BCP2: 0063006F
BCP3: A3290C78
BCP4: 00000000
OS Version: 6_0_6000
Service Pack: 0_0
Product: 256_1

Both crashes point to a hardware problem. See if Memtest (http://www.techspot.com/vb/topic62524.html) shows any errors. You can also try the RAM in another slot.

What speed is the RAM and what speed are you running it at?