After NIS2009 installation local network not accessible

How to fix? 

 

Hi

 

Fresh installation of XP Pro with SP 3, all updates installed. 

I downloaded from Symantec NIS2009 trial demo and installed it and run updates.

But now this  PC doesn't show see any other PC in the network under My Network Places, that's where I'd expect to see and connect to other PC when needed.

On the Network panel I found that these other PC's were set to Proteceted and changed these to Full Trust but no help.

Other PC's are still not visible. Finally I uninstalled NIS2009 and now all network works again normally.

 

How could I install NIS2009 without loosing local network functionality?