Vista can ping but cannot browse
(Also Can Ping but no internet, can ping but cannot access websites, connected but cannot access websites, etc.)
My experience roughly mirrors the one at http://www.computing.net/answers/windows-xp/can-ping-websites-but-cannot-browse/170013.html
That is, a laptop came in for repair that could ping, could get it’s windows updates, etc, but IE and Firefox would not work – going immediately to connection refused, etc.
While there wasn’t any clear evidence of Symantec services on this machine, it turned out that the solution was to run the Norton Removal Tool. (This was a Compaq laptop that probably came with Norton pre-loaded.)
Norton Removal Tool is free from http://service1.symantec.com/Support/tsgeninfo.nsf/docid/2005033108162039 – pick any recent Norton program, as the tool is the same for all of the ones in the list.