Installed a new disk on my XP machine for backup. In XP the disk is shared, users can change files. My windows 7 machine sees the disk and the files on it, but it cannot open them, and it will not allow to write to the disk. It says I don't have permission. Don't know what else to do from the XP side, and Windows 7 won't allow me to change permissions for the new drive on the XP machine. My feeble brain has never been able to wrap around the permissions, etc., of Vista/Windows 7. I know the answer is simple. I just don't know what it is.