Four hours? you have a lot more patience then I have, I gave up after one hour because I thought it was frozen. Perhaps I have to try again and keep it running for a night. But I really hope SM finds a solution, because this isn't normal and extrenely annoying.

I had a good running system before I upgraded to windows 8.1, I really regret that I did this.

-How can you improve things when you don't make mistakes?