Why can't PowerQuest Drive Image 7 find my C Drive?

I have been using PowerQuest Drive Image 7 for some time. All of a sudden when I went to make another image of my C Drive an error appeared basically stating that Drive Image cannot find my C Drive.

The message is ...

Unable to retrieve drive properties
Specified argument was out of the range of valid values
Parameter name: '0' is not a valid value for 'displayindex'.

.... how has this happened? Can I do anything to fix it?

(I have uninstalled and reinstalled Drive Image, but this didn't work.)