is not writable / "must be restarted" infinitely

[Keithustus]

My last laptop got ganked by a bad repair shop so I've just bought a new one, Windows 7 Pro 64-bit. I downloaded the last version of BS Player Pro that my license covers and installed it. When I try to play a video, it brings up the license-key screen. I type in my name as it is on the license and paste in my code. Then problems occur depending on my installation settings:

1. If I installed BSPP using global "all users" settings, then when I enter the key, it says the file/directory is not writable. So I can't play videos.

2. If I installed BSPP using the "just me" user settings, then after I enter the key, it says BSPP must be restarted before changes will take effect. So I restart. Then when I try loading a video, or opening a video in Windows, it brings up the license key screen again. This occurs infinitely.

Help?!