Tries to connect to network shares on port 80

I have seen a couple of times that vista tries to access network shares on
port 80 (using wireshark). Disabling Webclient in services or lowering it in
the "network provider list" does not make any difference.

Solution has been to wipe the client and start over again.

Has anyone seen this issue and been able to resolve the error without
reinstalling Vista?

Regards, Lars.