WinSockFix

After you remove some applications, you might realize that you can no longer connect to the Internet. This often occurs because of missing or invalid registry entries that have been modified by the aforementioned app removal. Rather than reinstall your Windows operating system, you can give WinSockFix a try.
WinSockFix is a free WinSock/TCP repair app that you can use when your web connection is corrupted due to removed or invalid registry entries.
This is how it works: when you remove adware components or make a mistake when uninstalling some firewall applications or other type of programs, WinSockFix detects the problem and attempts to fix it. This is so much better than having to go through the trouble of reinstalling the whole operating system, just because the Internet connection is down.
If you are in any way afraid to make changes in the Windows registry files, then WinSockFix has the option of backing them up, using the dedicated button called ReG-Backup (an option which is highly recommended).
Basically, WinSockFix detects the current operating system you are running on, releases the IP address and gets you "offline," resets the TCP through Netsh.exe (only available for Windows XP), then removes the current registry TCP and WinSockFix values. After this, it imports new registry values that function properly, backups the current Hosts file and replaces it with a standard one. The final step is to reboot the computer.
The bottom line is that it is best to use WinSockFix when you want to repair your Internet connection, as you just might be surprised at its efficiency.