Trying to upgrade from Wondows 7 Pro to Windows 10. This process has crashed about 10 times, have been going back to Windows 7 working on drivers. I did a "clean boot" and did get Windows 10 to install. But then I went back to a normal startup, which killed it on reboot. I'm trying to boot up in Safe Mode to change the startup so I can reboot. I cannot get to Safe Mode. Most methods to get in Safe Mode in Windows 10 requires you to be able to boot up. I can't. I have a Windows 10 ISO disk, have booted up with it, finally got into Safe Mode, but while in safe mode, now there is not mouse, cannot do anything.