You have it on a CD and you are popping that into the computer, right? Is this a new realflight 6.5 or? Try going directy to that drive in your computer and when that comes up click on Open, and installation link should be there somewhere. You might go to Programs and see if it installed enough there to show Realflight anything, then un install that.

Realflight has good support. You can call them or email them at [email protected]