So I finally got my old copy of Dr Quandary from home and I tried to install it using dosbox .74. The problem I get is when it asks what drive to install to. It only gives me two options. Either the drive the install files are on or a nonexistent Z drive. When I do try to install to the first one it gives me this error.

the output drive cannot be the same as the input drive

Any help would be greatly appreciated.