Bluescreening when downloading

Ok i upgraded from xp32 to windows 7 build 7100 x64 and i get random bluescreens when i download. Its very random sometimes i get lucky and it won't but i hardly get through a 30meg file without it bluescreening. Using steam games download it happens very often so cant get my games.

Thought it could be a memory problem but have done a windows memory diagnostic tool test and had no errors and come to conclusion that playing games like Assasins creed and Prototype for like 5/6 hours without a problem means its not a hardware/software its just a bug with downloading.


Motherboard - Asus p5k
Processer - Intel Quad Q9550 @ stock
Graphics card - Nvidia Geforce 9800 GTX
Memory - 4gb Corsair DD2 Twinx 8500

- No yellow flags in Device manager

Anyway here is a image of the bluescreen

And after i turn it back on this comes up in a window

Problem signature:

Problem Event Name: BlueScreen
OS Version: 6.1.7100.
Locale ID: 2057

Additional information about the problem:

BCCode: 3b
BCP1: 00000000C0000005
BCP2: FFFFF88002C9D02A
BCP3: FFFFF88008B86C60
BCP4: 0000000000000000
OS Version: 6_1_7100
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:



Well thats really all i can think of to put on here if you want anything else say...
I might try a full clean install but im quite a noobie with formating and thought installing the windows 7 formated the HD and reading some posts on here i guess it dont. So if anyone can help me out here as well would be appreciated.
Thanks in advance :)

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