|You have answered your own question in post #4.|
Q is the virtual drive that has been created by PowerISO.
If you do not want it to show then open up PowerISO
Select options > configuration
click on Virtual Drive Tab
Select <Disabled> from the "the Set Number of Virtual drives:" drop down table
Q drive should no longer be displayed.
Virtual drives are useful for mounting and reading/using files from an ISO image without needing to burn the ISO to a CD/DVD.
PowerISO supports various image formats in addition to its own DAA proprietary format . Examples of supported formats are ISO, BIN, CUE, NRG, IMG and several other popular formats.
☺ When everything else fails, read the instructions.