I have a Dell AIO 922 and am using Windows 7. I downloaded the files from the drivers page but the files there don't seem to do anything useful:
R153719.exe creates a drivers folder which in turn contains a Fax folder that has a various files and a Setup file that does nothing.
R166239.zip has only a Clean-Up utility which removes older driver files (irrelevant since I have no Dell driver files, old or new).
If I connect the printer and try to search for driver files, my system finds nothing.