When starting GeForce Exprience I get an message indicating "Geforce Experience encountered an error and must close" or an error indicating ShadowPlay can't be installed in Windows 8.
GeForce Exprience with ShadowPlay requires the Microsoft Media Pack. Some versions of Windows 8 and 8.1 do not have this installed by default. Please go to the link below to download and install the Microsoft Media Pack.
Thereafter, reboot your PC and reinstall GeForce Experience. http://www.geforce.com/geforce-experience.