Problem with Network Trust Level - how to keep the preferred setting?

I have NIS 2009 16.5.0.134, had just a few days.   Just noticed one day that in my XP SP3 -machine was not found in my wi-fi network, and found out that the NIS 2009 had configured its Network Trust Level to "Protected" - as a result my shared printer that's connected to that computer, was not found in the wi-fi network, nor the shared folders in that computer.

 

I set it to "Shared", but every time i shut down the computer and turn it back on, NIS has re-configured this Trust Level setting back to default, "Protected".   Why it does not keep the "Shared" setting?

 

(In my laptop, that's in the same wi-fi network, has as well Nis 2009, same version installed, and it remembers the "Shared" setting.  The OS in the laptop is Vista Home Premium 32-bit)

 

Could anybody please help me ; is there any way to get NIS 2009 to perserve the Network Trust Level setting?

 

Thanks.