Originally Posted by rjfvillarosa
Have you tried uninstalling AVG yet?
No, but I turned on password-enabled sharing in the HTPC Homegroup options and hey presto, I can open all the shared folders. No idea if it was the trick, but I'm happy it's working now. I didn't even have to retype my credentials to access the shared machine.
Gigabyte EP35 DS3R, Intel Core Duo E8400 3.0 Ghz, Asus EAH5850 1GB, Western Digital 750 GB 7200rpm 16 MB cache, Corsair 4 GB DDR2 800, Thermaltake 650W PSU, Antec 900 Case, Windows 7 64 bit on Corsair 80GB SSD