Things to consider:
With Windows 7 and newer, it should be standard practice to install Pro Tools(and any other program) using the Run as Administrator option(right-click on the Setup file). Ditto to using that setting under Properties>Compatibility(as you did).
Check BIOS(or EUFI or whatever its become) to see if it lists a floppy drive. If it does, disable it(even if the PC has no floppy)
Remember to NOT ever try to use drive letter A: or B: as those were reserved for floppy drives(and will cause problems if used with hard drives).
On any Windows machine, DON'T leave a disk in any CD/DVD drive while running Pro Tools(unless you are needing to import audio files). That can really slow things down
