Happy New Year!
There is a nice Web site put together by PC Tools (a company that makes, shockingly enough, PC software tools). It contains a list of how to update your system by playing with the registry. THIS IS NOT FOR BEGINNERS! However, it's a very powerful area. For example, one thing that you can't fix without messing around in the registry is how the Windows system reboots after downloading automatic updates. You have to enter your registry and change/add a value in it.