NIS 2011: You do not haver poermission to use this network resource

Hi,

I recently install NIS 2011 on each of our 3 PC's of our network. (We previously used McAfee Total Security)

The network has been working under McAfee.

 

PC1: Win 7 64 bit

PC2: Win XP Pro

PC3: Win XP Pro

 

The error masasge received is : "You do not have permission to use this network resource. etc

 

PC1 can see all shared folders on PC2 but not PC3, PC2 can see folders on PC1 but not PC3, PC3 can see folders on PC1 and PC2.

 

I have rearched other forums without any joy as to appropriate fixes.

 

Any suggestions before I have to reconfigure all networ setting?

 

Thanks and Regards