Hey All: I've just finished googling this, and found that this is a common problem, and yet it feels like nobody has linked it all together yet. I'm posting here in the hopes that one of the professionals has either found the solution, OR someone from Microsoft will take note of this. Periodically, when saving to any folder generally within the local user's folder (from the "Pictures" folder, through to the Desktop itself), I get the error "You don't have permission to modify files in this network location." This is not linked to any one particular piece of software (I've experienced it in Firefox, Office, and other programs that I run), and nor is it linked to any particular filetype. What ends up happening is the file is created in the location (including the name and filetype), but it remains a 0kb file with no data. The fix is simple and an annoyance. You need to merely leave the folder, and re-enter it. It seems that Windows does not verify a user's permission settings upon initial entry to a new folder, but only bothers to verify permissions after the folder change. When you re-enter the folder, you will see the 0kb file, and Windows will prompt you to overwrite the file. It seems that there's as many different solutions as there are Windows Administrators. I can confirm that my NOD32 is up to date, Windows Search has been enabled and disabled, I have not modified the location of any temporary folders nor the true system folders (though I have modified the location of my user's Documents, Pictures, Videos and Music folders). I have not yet experienced it after disabling UAC, though I find that the bug is hard to replicate and tends to arise randomly. Besides - I'd like to think that UAC has SOME benefit. To the question: Does anybody have a solution yet for this issue? Have we managed to come up with something that actually works to fix it? Or are we just waiting for Microsoft to issue a patch for it (kind of like the fact that the profile service loads too slowly on Vista/7)? Thanks a ton! --Databoy2k