Everytime I click turn on Personal filesharing in the Systems Preferences, it immediately turns itself off ( I can mount network drives, just can't share mine). Oddly enough, ever since this problem has started, I also cannot connect to Apple's software update servers or use a shared printer (the computer can see the printer, but refuses to print). I've tried creating new network locations, turnd my firewall off, and repaired disk permissions. Any help would be appreciated.
Kbee