I played around with the following download a little bit to see if it would be an easier fix for people. Of the problems I've seen so far it should fix ~75%.
Of course, if you run this and it fixes you I don't get to know exactly which problem you were hitting and I am still trying to gather data... but if you really want to take the easy way out and don't like editing your registry manually:
http://support.microsoft.com/default...b;en-us;810509
Note that after downloading it, you have to run it with a -l switch (like "Pnpreg –l" you can't just double click it).
Disclaimer: I profiled this tool and it looks like it itterates over every single key under "enum" and resets them to default permissions provided you yourself have access to do so. While this is still targeted at the exact problems people are seeing, it's more of a shotgun approach then a targeted change.