I am running a late 2012 MacBook Pro retina edition, 16GB of ram, parallels 10 and windows 7 (NOT going to windows10). I have windows installed and running in full screen mode no issues to this point. I have some programs that I want to run in windows from an external hard drive. When I plug an external hard drive into the USB PORT windows sees it in my computer just fine, but when I run an install program like ms office for example the install program does not recognize the external as a potential installation drive. Am about out of ideas on how to fix this so am looking for help here