Upgrading to Windows 10 has caused my Office Starter to malfunction. It says the application virtualization client could not launch. dismounted due to a severe error. I tried repairing but it wouldn't work. I tried contacting Microsoft and they ran a troubleshooter which didn't work for my problem. I tried changing file associations (which has worked before) but it hasn't worked this time with the latest win10 update. I can't get into any of my Word or Excel files. Help??