Just downloaded Norton 360, file sharing was working, now its not!

Bare with me, b/c I'm new please: I just downloaded the newest version of Norton 360 onto the computers at my office. We are on a private network and only have 5 computers, so it seemed ok. However, prior to our last subscription of Norton running out, we were not having the issues we are experiencing now. It is all with the file sharing. I have gone into the traffic rules and allowed and also unchecked the "active" box at different times to see if this would take care of the issue we are having, but it did not. We share Quickbooks and other files amongst computers, so it needs to be rectified. I know it has something to do with the firewall because when I shut it all the way off, it works fine. When I shut off the Norton firewall, but turn on the Windows firewall, it does not work. Currently the Windows Firewall is on with the Norton firewall off. I'm not a tech person, so this is as far as I dare go. I'm not overly comfortable with leaving the Norton firewall off, but I really have no choice right now. Also, last week, I had it set up with the "Block Windows File Sharing" changed to allow, and it was working fine. We came in this week and its been nothing but problems since yesterday! HELP!