Network card issues?

I have been having several issues with my Mac blue screening for no apparent reason, and they all revolve around whether or not the network card is turned on or not. Originally with XP x86, it was the wireless that made it blue, now with Windows 7 x64, it's both wired and wireless, but it happens more often with the wired connection, especially if i'm surfing the internet or playing Modern Warfare 2 online. I tried updating the Marvell internet controller manually, but that didn't help, since it blue screened 3x in 10 mins. Right now i'm going through a Windows update, but does anyone have any ideas of what this might be? Thanks