If you need to install TCP/IP on your computer ,in case you deleted it or some or other reason then do the following instructions from Microsoft:
Right-click the network connection, and then click Properties.
Click Protocol, and then click Add.Click Have Disk.
Type C:\Windows\inf, and then click OK.
On the list of available protocols, click Internet Protocol (TCP/IP), and then click OK.
If Internet Protocol (TCP/IP) does not appear, follow these steps:
Click Start, and then click Search.
In the Search Companion pane, click More advanced options.
Click to select the following three check boxes:
Search system folders
Search hidden files and folders
In the All or part of the file name box, type nettcpip.inf, and then click Search.
In the results pane, right-click Nettcpip.inf, and then click Install.
Restart the computer.