Brother MFC-7820N Sharing problem

Hi Guys,
I have a 3 computer network
192.168.1.101 Windows 7 Ultimate 64 Bit
192.168.1.102 Windows XP Professional 32 Bit
192.168.1.103 Windows 7 Ultimate 32 Bit USB Brother MFC-7820N
192.168.1.105 Samsung CLX-3170 Bluetooth Printer
All of them has Outpost Security Suite Pro 2009

When I go to Brother MFC-7820N USB Printer Properties and want to share, got an error message : Printer Sharing couldn't be saved.Operation could not be completed (error 0x0000006d9).

I've been suffering with this problem for weeks. Not finding the solution anywhere.
Any help is appreciated.
Thanks in advance

Uninstall Outpost from all of your computers, then reboot. Next, try this:

http://windows7forums.com/windows-7...ettings-could-not-saved-error.html#post134826

Problem Solved!

10 Months passed...
if you run Windows 7 and your own firewall.... you MUST turn WINDOWS FIREWALL ON to be able to share the printer.(did not cause any trouble with my ESET Smart Security 4.)
Now it works as it supposed to almost a year ago. Accessible from all the computers on the network.