Clarification on this: Been working on this issue for over 2 months on 4 computers, this is what i've found.
Note: Not all fixes will work on a pc due to various stages of updates, patches, etc. No matter what anyone says or claims. What works for me, the other person, or even tech support, may not due to some odd configuration on your pc. None the less, this is what I've done on the final 3 computers that didn't auto update the readyplay.
- get to the point in media center that it says Readyplay Failed to update, do you wish to try again.
(OPTIONAL) Download the Reset DRM Tool from Microsoft, Change Compatibility Mode to Windows 7 (or lesser version of Windows), Run the Tool As Admin. It should Install and say Successful.
- Open up Windows "Services" via Control Pannel > Administrative Tools > Services.
- With Media Center Open and Showing "The PlayReady update was incomplete. Do you want to try again?" Goto the "Services" pannel you just opened and scroll all the way down to "Windows Media Center Receiver Services", double click on it, then click "Stop"
- Navigate to the ReadyPlay HIDDEN folder (C:\ProgramData\Microsoft\PlayReady) and THEN delete the mspr.hds file.
- Go back to the STILL OPEN & RUNNING, Media Center and click "Yes" and "Next" to the Update PlayReady question. It should immediately zip past and say update complete & you can watch and record copy protected bla bla bla. It may also update a guide or something too.
If this doesn't work for you after 5-6 tries, you might have something else blocking you, but you don't need both 32bit and 64bit PlayReady installed for it to update. It's the 'Service' that is truley stopping the update, but just simply stopping it w/o those others steps may not get it working >.<
Good luck!