[Roy Dennis]

Go to control panel, depending which view you have set in control panel either select Hardware & sound/then Auto Play or From the other view go straight to Auto Play.
In the dialog that opens you should see a tick box top left, untick it.
There are also drop down arrows to select the action windows takes with various types of disc, if you want to experiment with these set the drop down boxes to "Take no action" for the items that you don't want auto play and whatever action you want for others.
If you want to use these selected items you would then have to tick the top left box but MTU recommends not allowing any.

As far as the not recognizing the drive, if this a plug in usb drive I assume you plug it in before starting Hoster, when you open Hoster go to Tools CD/DVD drives. Do you see the drive there, if so does it show Good.
Click the retest button any way then in the bottom where it reads "Default Read Drive" use the drop down arrow to select the drive and press save. It should now work, What might happen if you start Hoster with it disconnected then the default drive might change if you want try to read a disc in Hoster without it connected.