I have 2 computers sitting side-by-side... both connected to the LAN side of the same router both are running XP (SP2) both C: drives are setup for full file sharing I'm using the default Windows Explorer file manager in both I'm logged onto both as Administrator. Here's the strange thing. If I open a file manager in both, from within computer #1 I can copy files to computer #2, or I can copy files from #2 to #1. No problem yet. But from the file manager within computer #2, while I can "reach" over to #1 and copy files back to #2, I can't copy from #2 to #1. I get a Windows error msg saying "Access is denied. Make sure the disk is not full or write-protected and that the file is not currently in use." No, the disk is not full. No, the disk is not write-protected. And, No, the file is not currently in use. So here's a summary of what's going on. From within computer #1 -- I can copy files either way, from #1 -> #2 or from #2 -> #1. From within computer #2 -- I can copy files only one way, from #1 -> #2 but not from #2 -> #1. Do any of you true network gurus have an idea what is causing the "Access is denied" to someone logged on as Administrator? Thanks for any suggestions.