BcCode a bluescreen error

[tom4u]

Hi guys,

I cleaned my pc after it crashed days ago due to another bccode 100007e error.

BCCode: 1000007e
BCP1: C0000005
BCP2: 8C19DC19
BCP3: 88D9FB40
BCP4: 88D9F83C

mini120808-01.dmp

This time, I got the bccode a error.

BCCode: a
BCP1: 0000001B
BCP2: 00000002
BCP3: 00000001
BCP4: 81C12FE9

Mini122208-01.dmp

Please help me check my minidumps.
I downloaded the Windows Debugger but I don't know hw to use it.

If its caused by my gfx card, I'll gladly change it but I'm not sure what is the problem. Please help.

Thanks,

Tom