Let me ask a question for clarity: When you plug the External Hard Drive into your Win7 Computer and go into My Computer, do you see “CD Drive (Letter:) Utility_HD-CXU2”?
If you double click on that, does it auto run the Drive Navigator?
If not, can you Right Click> Open and have access to the contents? Can you see DriveNavi.exe?
Double Click that and see if it will start the program and at least let you enter in the password.
That is what I have to do with mine. Once I enter in the password from there, I can access the Hard Drive just like any other drive I have connected to the computer.
You need to go into the "CD Drive" file structure and run the programs from there.
They won't let you install anything on Win7, but you shoudl be able to access the drive. (At least, I can when I do that.)
I hope this helps!