TCP/IP is a network protocol used by Windows to transfer Website information and various other things. The file Tcpip.sys is the control center for these communications in Windows, errors along side this file usually stop access to the internet.
Since this seems like a file corruption to me you should just repair your installation of Windows and get all of your Updates again. That should fix the error and this would probably be better in the Windows Forum as an issue in Windows. Report back whether if it is fixed or next in your next reply