BSOD, while not using

Getting BSOD when not using the computer, have never gotten it when I'm using it. But if I leave for about 10-15 minute it usually get BSOD.

System:
Windows 7 Pro x64, Swedish
OEM

Hardware is about 2-3 years old, graphic card is 2-3 months old.
Formated the whole computer at the same time I switched graphic card.

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 1053

Additional information about the problem:
BCCode: 3b
BCP1: 00000000C0000005
BCP2: FFFFF8800495B817
BCP3: FFFFF88007437900
BCP4: 0000000000000000
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C: \ Windows \ minidump \ 020811-15662-01.dmp
D: \ Temp \ WER-21 746-0.sysdata.xml

Read our privacy policy online:
Windows 7 Privacy Statement - Microsoft Windows

If the privacy policy online is not available, please read our Privacy Policy Offline:
C: \ Windows \ system32 \ en-US \ erofflps.txt

The system health report is in Swedish, don't know how to make it in English when my Windows system is in Swedish. (If there is a way please post!)

Any help would be greatly appreciated!

Dumps blames your Radeon drivers.
Uninstall it and use driver sweeper to remove leftover display driver files
Phyxion.net - Driver Sweeper

Then reinstall the latest driver
ATI Radeon


Update your Realtek driver
Realtek

Code:

Rt64win7.sys  fffff880`040a1000 fffff880`040d3000 0x00032000 0x49a65b0d 26/02/2009 13:04:13

Code:

BugCheck 3B, {c0000005, fffff88004988817, fffff88006e4c900, 0}
Probably caused by : atikmdag.sys ( atikmdag+90817 )