Have you tried right-clicking on the shortcut to the program, or the .exe, and selecting the "Run As Administrator" option? Do so even if your user is an Admin.
After any uninstallation and before any reinstall try right-clicking on the actual Setup.exe and selecting the "Run As Administrator" option? Do so even if your user is an Admin.
See also, Control Panel\All Control Panel Items\Troubleshooting\Programs\Program Compatibility Troubleshooter.
Do you have the same problem from within Safe Mode, and also if you try a Clean Boot? Perhaps some security type program is interfering? I don't know why it works for a couple of days, that is a bit strange.
How to start Windows 8 in Safe Mode
http://www.bleepingcomputer.com/tutorials/start-windows-8-in-safe-mode/
How to perform a clean boot in Windows
http://support.microsoft.com/kb/929135/en-au
How to perform a clean boot to troubleshoot a problem in Windows Vista, Windows 7, or Windows 8
http://support.microsoft.com/default.aspx/kb/929135
What happens if you create and test with another Windows user rather than your current user?
Create a user account Windows 8.1
http://windows.microsoft.com/en-au/windows/create-user-account#create-user-account=windows-8