BSOD at random times... even when idle during e.g. 2 hours

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Short error info:
ntoskrnl.exe+7cc40

General situation:
I bought this new pc in August 2011. The shop where i bought the components built the system and installed the OS. I did not reinstall it (yet).
Since the moment i got the system, i had more BSOD's than i had in the last 10 years.
There is no (user) program i can isolate as a possible cause... ntoskrnl.exe isn't a "real user program" imho

System info:
You can find them the system specs inside in my profile, but most relevant info might be:

• OS: Windows 7 Professional x64 SP 1
• CPU: Intel Core i7 2600 Boxed
• Motherboard: Asus P8Z68-V Pro
• Memory: 8GB G.Skill Ripjaws X F3
• Graphics Card(s): MSI R6850 Cyclone 1GD5 Power Edition/OC
• Hard Drives: OCZ Vertex 3 120GB (System) + Samsung EcoGreen F4EG HD204UI, 2TB (Data)
• PSU: XFX 650W Semi Modular XXX Edition

Crash info:
This is part of the BlueScreenView info:

• Bug-check-text: SYSTEM_SERVICE_EXCEPTION
• Bug-check-code: 0x0000003b
• Parameter 1: 00000000`c0000096
• Parameter 2: fffff880`0e3be972
• Parameter 3: fffff880`0e3fad90
• Parameter 4: 00000000`00000000
• Caused by driver program: ntoskrnl.exe
• Caused by address: ntoskrnl.exe+7cc40

The information collected by BSOD Dump & System File Collection app are in the attachment, as well as the system health report.

Thanks in advance for any help!
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Forgot to mention: Windows Updates are applied on a very regular basis (i.e. almost as the come in).