Internet randomly dropped out at around 5 PM yesterday and haven't gotten it working since. When I connect to another computer (which I'm posting on right now) it works fine. The problematic computer is running Windows 7 64 bit, this computer is running Vista. There is no router involved. I've tried rebooting, disabling/renabling the adapter, rolling back the driver, a system restore, searching services.msc for bonjour (didn't see anything suspicious), updating to the current nforce driver, and manually setting an IP configuration among other things. I did an /ipconfig all on the computer that is working and used those details on the first computer while manually entering the IP, gateway, etc info. This got rid of the "doesn't have a valid IP address" error... great, right? But it's replaced with a generic "Troubleshooting couldn't identify the problem." When set to automatically obtain IP address I get a 169.x IP. I've tried pretty much every solution I've ever seen posted regarding this issue and nothing's working. It's not a problem with the ISP (another computer works fine), or the cable (another computer works fine), and my computer has two ethernet adapters; I find the possibility of both failing at the same time hard to believe.