Blue Screen of Death

Hello,

I've updated my video card from the stock one and after that I've started getting Blue screeens of death. I removed the video card but the problem continue to appear. Please help.

signiture:
name: BlueScreen
version: 6.1.7601.2.1.0.256.1
ID: 1026

more info:
BCCode: 3b
BCP1: 00000000C0000005
BCP2: FFFFF80002DD709C
BCP3: FFFFF88006704110
BCP4: 0000000000000000
OS Version: 6_1_7601
Service Pack: 1_0
Product: 256_1...

Blue Screen of Death