I have Windows 7 Home Premium 64 bits. I have all my photos in an external drive that I created in a Vista pc. I plugged it in my new Windows 7 pc and changed the ownership of all the files to me, since I knew otherwise I would have permission issues. But that did not help! Now in Picasa I can add any new photos, but when I try to edit old ones, I get a permissions error! I have figured out how to bypass this: I change the permissions for all users to read/write for the "originals" directory and the files that I want to editt, and then it works...but this is REALLY PAINFUL! It seems like a Windows 7 bug to me: since I should be now the CREATOR/OWNER of all those files, and they have "special" privileges, it should work... Which brings me to another, IMHO, bug with Vista/Windows 7: why it does not tell you in the Properties of a file who the CREATOR/OWNER is? I have not been able to figure out who the CREATOR/OWNER of those files is (i.e. if the problem is that the command to change ownership failed and did not tell me... C'mon, Microsoft, it should not be that hard to find out who the CREATOR/OWNER of a file is! Why did you have to come up with such a complicated ownership scheme, when the one for UNIX works so well!