I had the same problem of getting blue screens but with "Execution in non-executable part of memory" or something like that. And I wasn't able to use any network related activity.
So I uninstalled my firewall (nvidia access manager) and restarted my pc and now it works fine. You can then reinstall the firewall.
Try this, as it might be the same problem.
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Winchester 3200+ @2,500MHz
LeadTek 7900GT VOLT MODDED @ 680 core, 1800 mem
2x1GB Transcend DDR400 @ DDR454 2.5,3,3,5,1T
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