Hi My Windows 8.1 have tried to update itself. Whenever Windows updated approch 100% of progression, all of sudden it says "Update can not be completed. return to old one" After that, it takes so many time to return original one. How can I fix it? System info OS: Mavericks OS X 10.9.X Parallels 9 Build: 2422 Guest OS: windows 8.1
