I have realflight G 6 and tried installing it on my new computer (HP Pavilion p6-2317c PC Tower, AMD A6-5400K, 8GB Memory, 1TB Hard Drive )
When I put the RF 6 disk in the DVD and then click install the computer freezes up!
After many time of trying this and restarting my computer with no luck, the install works fine on my other computer, I gave up and left the computer alone for a long period of time then the RF installer popped up!
I then installed RF6 but each time the installer ran I had to leave the computer frozen for a long time.
Once the program was installed it ran fine!
The the update to RF6.5 had the same problems, taking a long time 15 minutes for the run the installer to run update.

I have since recovered my computer and still have the long wait for the installer to run.

Is there a compatibility problem with windows8 and the installer program?.
Hope this helps someone
Rickc