The default action for "Drive" as a "file type", may have been changed.
Go to Control Panel, Folder Options, files types tab.
Under the Extensions column, there's a list of extensions. Scroll down and you'll see a number of N/A.
Find the file type called "N/A Drive". Highlight it and click Advanced.
In the Actions box, all I have is the action: find
If you see anything else, report back.
You may be able to cure it in Folder Options, or you may have to go to Regedit. But don't do anything yet.
I also suspect that something like Tweak UI can do these things for you.