Many programs like to adjust and change the TCP/IP stack. In older versions of windows the stack could be corrected by uninstalling and reinstalling. However, since the stack is now a core component, uninstalling is no longer possible. Thank goodness, however, that it can be easily reset.
1. Left click the Start button
2. Select run
3. In the open box type: netsh int ip reset c:\resetlog.txt
c:\resetlog.txt will show what changes existed. You can change this to whatever path you wish.
This command rewrites the TCP/IP registry keys. Essentially, this causes the same result as the removal and the reinstallation of the protocol.
TIP:
If you can ping both the loopback address (127.0.0.1) and your IP address but you cannot ping any other IP addresses, use the Arp tool to clear out the Address Resolution Protocol (ARP) cache. To view the cache entries, type any one of the following commands:
arp -a
arp -g
To delete the entries, type the following command:
arp -d IP address
To flush the ARP cache, type the following command:
netsh interface ip delete arpcache