Microsoft Office: Disable Hardware Acceleration

Part 1: Group Policy

Group Policy: User Configuration > Administrative Templates > Microsoft Office xxxx > Miscellaneous > Do not use hardware graphics acceleration = Enabled.

Part 2: Group Policy Registry Preference

Group Policy Preference: User Configuration > Preferences > Windows Settings > Registry:
HKCU\Software\Policies\Microsoft\Office\xx\PowerPoint\SlideShow:
DisableHardwareAcceleration (REG_DWORD) = 0x1