Since the Anniversary update, Windows has updated 3 times. Each time I have restarted my PC to install, it just runs and runs ie the little whirly circle on the screen and an occasional blip on the hard disk light. The first time I let it run for 3 hours as I saw this being quoted in internet searches. In the end I just turned off my PC and restarted it. It started normally, reached 100% complete install in seconds and was fine. The second 2 updates went the same way.

Is this a known issue and is there a solution?