I uninstalled MV through Steam, then reinstalled it. And downloaded trial MV before buying it in a Humble Bundle Sale that came with MV, VXAce, VX, XP, and a whole bunch of DLC.The screenshot above shows that you deleted it via Windows Explorer. That is not uninstalling. To uninstall, you need to open Steam, choose the application, and tell it to uninstall.
The other thing is - you don't have two versions of MV, do you? The Steam version AND the standalone version? Uninstalling/deleting one will not affect the other, so if you uninstalled/reinstalled the Steam version, but you're running the standalone version, that won't have changed anything.
That was the thing I did. I downloaded some parts from the Resource Workshop and started putting them in. I checked the generator several times, and at some point, it just removed all the images.