I downloaded the fix it tool and ran it but I can't tell if it did anything. Is that how it works?
Yes.
Disconnect the printer. Uninstall the software for your Pixma MG2120 and reinstall the drivers from the link below. Reconnect the printer, restart your computer and test.
Please use Autoruns to delete 1 entry where the words “File not found” appear. With Autoruns you can uncheck an item, which disables it from starting, or you can right click an item and then delete it. Click the Everything tab and look for the rows highlighted in yellow.