First, be sure everyone has exited POSitive. Then follow the instructions in Phase 2 of the How to Update POSitive knowledgebase article and move the renamed copy of the PRM folder instead:
See: http://kb.gopositive.com/howtoupdatepositive
After you move the folder, please review steps 4, 5, and 6 of our Network Setup Basics knowledgebase article:
See: http://kb.gopositive.com/networksetupbasics