You could also try a Clean Install by downloading the latest W10 RTM build from the MCT page at Microsoft here:
Link Removed
Sometimes you will get different results on the production version of the Media rather than the Preview version. As one of the W10 Insider Testers several of us have experienced this. If you get the same no good result, I might suggest you swap out hard drives on the machine you are getting this problem on. Lastly, if the problem persists you might try reinstalling the RTM version on a different machine altogether than the one you currently are using. If this doesn't solve the problem, it could be a bug in W10 which you should report.
After going through these steps, you might find a solution that...