I have 3 Win 2000 workstations attached via a lan to NT servers. The workstations have a problem launching pdf files when you click on the document in the explorer window. If I first open adobe reader, I can do a file open and retrieve the file into adobe. Sometimes, the workstation will hang when looking at directories on a server in explorer as well. Any suggestions as to why this is happening is appreciated. NT is on service pack 6 and the Win 2000 workstations are at service pack 3.