I am having a problem with a windows XP PC. I have just installed service pack 2. The pc has a local share \\localbox\root. All works fine for a while, and then I get suddenly cannot access the share - even on the local box, I get "you might not have permission to use this network resource" error. There is no firewall running. Netbios over TCP/IP is enabled. The computer browser service is running. The share works fine for a while, then it suddenly drops off! Any ideas? PLEASE HELP!!