I moved a bunch of files off of my main computer, onto an external drive. But after doing that (and doing some rough spot-checking that the files work after copying) I'm also making zip archives, so when I have to move from external to external drive it won't take as long, and I won't have to worry about individual file copying fails.... While trying to compress some of those folders (other folders created the same way work just fine) 7zip gives me a diagnostic error: "WARNING: Access is denied." with some box after that? I've looked online, and the only suggestion I saw was to change the ownership of the directory (I'm running XP), so I followed instructions to do that, and it appeared that that worked. Deleted the old zip archive, and tried re-compressing... and I get the same error. So, is there some way to figure out why 'access is denied'? What should I be looking at, to try and figure out how to fix?