Now I am stuffed - just tried to go back to the earlier build, but told it cannot be done! I am stuck with no sound. Microsoft strikes again, maybe I will have better lick with Linux?
I only updated yesterday, and the windows.old folder is still there 37.1GB in size.
I have just one restore point since update, I will try that and then try going back to the earlier build, failing all else, my system will get a thorough clear out and a fresh install! No sleep this weekend.