How about trying this simple test:
Hold the CTRL key down as soon as you reboot the computer. It should bring you to the Safe Mode menu (a dos screen). If that doesn't work, reboot and start tapping the F8 key as soon as the pc starts booting. It should bring you to a safe mode menu.
Choose Safe Mode from the menu. I know, it doesn't make sense. But you're trying to break the loop and get the software to reset. So, let it continue booting at that point to safe mode. Then exit windows choosing the restart option.
If that doesn't work, try the other options in the safe mode menu, like Command Prompt.
Let it boot to that, and then exit out of it.
See what I'm trying to do here? Trying to break the cycle that's toggled somewhere.
Hold the CTRL key down as soon as you reboot the computer. It should bring you to the Safe Mode menu (a dos screen). If that doesn't work, reboot and start tapping the F8 key as soon as the pc starts booting. It should bring you to a safe mode menu.
Choose Safe Mode from the menu. I know, it doesn't make sense. But you're trying to break the loop and get the software to reset. So, let it continue booting at that point to safe mode. Then exit windows choosing the restart option.
If that doesn't work, try the other options in the safe mode menu, like Command Prompt.
Let it boot to that, and then exit out of it.
See what I'm trying to do here? Trying to break the cycle that's toggled somewhere.