Is there only one site that is generating this error? Do you have other sites on the same machine that work?
There are three things that could be causing the problem that I can think of, and you need to isolate the issues so you can see which one is causing the problem.
If you have other sites working, you could try abandoning that installation and reinstalling it. If no sites work, then you might have to reload WAMP.
There might also be a problem with your TCPIP connection and your local IP address. Here are some search results you can look at to see if you can check that out.
www.google.com/search?aq=2&oq=reset+loca...l+area+connection+ip I'm not an expert at TCPIP so I'm not sure what to advise for this.
Also set your ACL rules back to default levels and see if you get access when the ACL rules are not so restrictive.
Ed