I'm dual booting on my machine with Fedora 13 and Windows 2008 R2. Everything is hunky dory in Linux. Last night I restart into windows (to play some call of duty, and yes I know I can get that running under wine but that's a different topic altogether). Windows is telling me my network cable is unplugged. It clearly isn't because everything works if I restart back into fedora.
I tried hooking a different cable just in case, tried booting into safe mode with networking, tried uninstalling and updating the network drivers (it is a Realtek PCIe GBE nic) still the same thing. Recently (like in the last 2 weeks) I got a second display and a gigabit switch. I tried hooking in my old 100mb one and just the old display thinking maybe it is a configuration issue. No luck.
I noticed that the light on the nic always glows a steady green when I'm in Linux or booting into windows. A few seconds before getting the windows login screen it disappears never to be seen again.
At this stage I'm thinking it is either a virus or a windows update gone bad. Anybody seen this before?
My setup: Asus M4A89TD Pro modo, Athlon X4 630, ATI 4850.
Edit: Some more details: After I reinstall the drivers (using the ones obtained from vendor) the green light comes on for a split second and then dies again. During the boot sequence the last driver to load is ClassPNP. There is around 10 seconds silence then disk activity. The light dies after around 5 seconds of disk activity and ~2 seconds before the login screen.