1) first of all, are you certain OS5 is actually installed (check the boot screen when turning on).

2) Before doing anything, Run a checksum test (as described in the sticky topics in this forum) and report back with any errors.

3) The USB updates should work with your Audya unless you have changed the hard drive. If you have changed the hard drive, you will need assistance from your distributor or supplier of the replacement drive to re-initialise your USB updates.