Network problem

Hi, i just registered here and saw that this is active windows 7 support forum so I have pretty odd problem. So when I am downloading something with some client, example World of Warcraft or League of Legends, it only downloads 10 - 15 minutes and after that my network crashes ONLY in that computer but my laptop and ps3 stays online as normal. I've installed (alteast I think) all drivers in online.

OS Name Microsoft Windows 7 Ultimate
Version 6.1.7600 Build 7600
System Type x64-based PC
Processor: Intel(R) Core(TM) i7 CPU 930 @ 2.80GHz, 2801 Mhz, 4 Core(s), 8
BIOS Version/Date American Megatrends Inc. 1704, 30.12.2009
SMBIOS Version 2.5
Hardware Abstraction Layer Version = "6.1.7600.16385"
Installed Physical Memory (RAM): 6,00 GB
Motherboard: Asus Rampage 2 Extreme
video card: ATI Radeon HD 5700 Series

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