tcpip.sys is likely to be showing because some program is attempting to connect to the internet. Because it's corrupted it's attempting to send bad signals (either to tcpip.sys or through it), which confuses tcpip.sys. This confusion is what causes tcpip.sys to crash. Do you have any aftermarket ativiruses like ca internet security? Or if you dont know what program is causing this, do this: Navigate to: C:\Windows\Minidump folder.If you see any .dmp files, zip all of them, and attach that file to the next reply.