I am having a similar issue. It happens in any program where I may need to save something. Even in Firefox, if I'm downloading a file, a lot of times I'll get an error saying "You don't have permission to modify files in this network location, contact your system administrator." I simply click "save" again and it lets me save.. But I'm not sure why this is happening in the first place.. It only started a few weeks ago and happens frequently enough to be a real concern. I am operating my own PC, logged in on an Admin account and don't have a local network/workgroup set up. Any ideas?