TCP/IP help!

OK so I have Windows XP computer and have a LAN

I had a problem wherby I could not access certain websites, it came up with 'page cannot be displayed' and more and more websites were doing the same. I am on a laptop that uses the same network and it had the same problem.

So I browsed the interent for solutions and one of them said to go into the registry and delete 'winsock2,' which I did (and stupidly did not do a registry backup beforehand)

Now, when I start the computer, Norton tells me "you do not have TCP/IP installed" and I find I now have no connectivity as a result. I tried uninstalling the TCP/IP version 6 and re-installing it with little effect. I did a system restore and I looked in my registry and it said that winsock2 was there but I'm still having the same problem.
Also, I am now on the laptop and the internet works fine and I the 'page cannot be displayed' problem has disappeared.

What can I do? I'm thinking of wiping my computer clean and starting over but I don't want to lose my mp3 and endless photos

Any help would be much appreciated

 

Hopefully there were instructions for installing the winsock registry entries as well.