It seems that tcpip.sys is the most common problem. I would repeat Saltgrass' question if you have done something with those drivers lately? Or installed new hardware, software? If you can point your finger on a date when problems started, you could try a Windows restore point. If you go for that, it might be smart to manually uninstall any programs installed after that before you do the restore - Windows restore may leave some stuff, thus uninstall is a good way to proceed.
Another option could be, since it may be a registry issue, to run CCleaner.