*****************3 Methods of repairing connectivityMETHOD 1LSP-Fix
Repairs Winsock 2 settings, caused by buggy or improperly-removed Internet software, that result in loss of Internet accessLSP-Fix Home PageUsing LSP-Fix to remove Spyware & HijackersMETHOD 2WinSock XP Fix 1.2
It can often cure the problem of lost connections after the removal of Adware components or improper uninstall of firewall applications or other tools that modify the XP network and Winsock settings.
If you encounter connection problems after removing network related software, Adware or after registry clean-up; and all other ways fail, then give WinSock XP Fix a try.Download WinSock XP Fix 1.2METHOD 3Microsoft KB article to reset TCP/IP
One of the components of the Internet connection on your computer is a built-in set of instructions called TCP/IP. TCP/IP can sometimes become corrupted. If you cannot connect to the Internet and you have tried all other methods to resolve the problem, TCP/IP might be causing it.
Because TCP/IP is a core component of Windows, you cannot remove it. However, you can reset TCP/IP to its original state by using the NetShell utility (netsh)How to reset Internet Protocol (TCP/IP) in Windows XP
Internet connection problems
For Windows 2K/XP
Please go to Start -> Control Panel, and choose Network Connections.
Then right click on your default connection, usually Local Area Connection or Dial-up Connection if you are using Dial-up, and left click on properties. Double-click on the Internet Protocol (TCP/IP)
item and select the radio button that says Obtain DNS servers automatically
. Click OK twice, and restart your computer.
Warning: Some Internet Service Providers need specific DNS settings. You need to make sure that you know if such DNS settings are required before you make this change.
Try this--open control, internet options, connections tab, lan settings, uncheck the box next to "use proxy...."
These are all I know.