RobbieSan has a good idea but, you don't need to be in safe mode to see if you have duplicate drivers. and chances are you won't. unless you have been playing around. check and make sure one isn't a shortcut.
oDin I don't even have a network-card!!!
but I have used tweak-xp if that could be the cause I don't know.
What I found out in hidden devices is that I have drivers for a network-card but if I try to uninstall them I get a message that windows needs them to boot the system!!!! Weird