BleepingComputer.com: Media Sharing with PS3

I've used media sharing with my PS3 for over a year and it was working fine with Windows Media Player and SimpleCenter. Now, the tracks will not show up on my PS3 to play. I keep getting a message on Windows Media Player "Media sharing is currently disabled, either because the sharing service is not running or your firewall settings have changed. I do what is says to restart and it never works. I'm using Norton as a firewall and I have the programs listed as exceptions to the firewall. I have another buddy that has the same issue. Help Please!!!

Thanks,
Jeff