Ok, it's a bit of a desperate measure; but supposing you go through all the processes listed by the Program Manager, and Google the names to figure out what they do? There might be one that's using a port, or something.
Then, about the firewall - sorry to be a pest about it, but I've found that Windows is sometimes a bit more stubborn than smart. It might have turned the damn thing back on without telling you. Since we are getting a bit desperate here, can I suggest that you follow the procedure I linked to? (Sorry if you already did, it's not easy troubleshooting over the net.)
Then, about the firewall - sorry to be a pest about it, but I've found that Windows is sometimes a bit more stubborn than smart. It might have turned the damn thing back on without telling you. Since we are getting a bit desperate here, can I suggest that you follow the procedure I linked to? (Sorry if you already did, it's not easy troubleshooting over the net.)