Daemon Tools - Maximum number of virtual drives used?

I downloaded a bundle pack of the Sims 3, so I have multiple expansions installed. However I only had to mount Sims 3 Seasons, because it was the newest so I can play all of them off of that. I went to play today, and it said "No disc inserted." I've been playing it completely fine as recently as yesterday. I checked my inserted devices, and it listed Sims 3 Seasons. I ejected it, and went into Daemon to un-mount/remount it, however the virtual drive wasn't listed. So I clicked "add new virtual drive" and it said I already had the maximum number in use. I've played around with it before, adding and removing virtual drives, and I've never had a problem. Now I have a Q drive I can't get rid of, and can't access, and my computer isn't even recognizing when I insert a physical disc or plug in my iPhone. Any help solving the max virtual drive issue is appreciated, thanks!

You only need one drive to mount your game.
Its a virtual drive because you don't want to burn the ISO to a disc and insert it in your hard drive.
The easiest way to explain it is:
Hard drive requires a disc.
Virtual drive requires a file that would usually be burned onto a disc (usually ISO file for games).
Just mount the ISO file to the virtual drive and play the game.
If that fails, your files are corrupt.