When I download any big file in Windows 7 Professional 32 bit and Windows 7 Ultimate 64bit (2 different computer, with different motherboards and different network adapter cards) the network adapters will shut off and I will have to reset them. Anyone know what could be the problem?

Computers & Internet - Evga - nForce 780i SLI 3xPCI-E x16 PCI-E 2.0 Socket 775 Motherboard...