HALF A PILOT,
Did you try uninstalling PS7 and deleting any references to it in your Windows Registry before installing it again?
If you have an antivirus program running, try disabling it before you launch PS7, to see if it will launch.
There are more things to check but lets start with those two first.
Take Care,
Capt. Richard J. Gentil, Pres.
Naples Air Center, Inc.
Custom Computers of Naples, Inc.