You’ve done everything in troubleshooting but you can’t enable the aero effects or transparent display. The solution is you should uninstall the installed mirror software such as projector etc.
On your desktop, right click the ‘COMPUTER’ icon, then select ‘MANAGE’, then ‘DEVICE MANAGER’, then ‘DISPLAY ADAPTERS’, select ‘MIRROR SOFTWARE YOU HAD INSTALLED’, just ‘RIGHT CLICK’ and ‘UNINSTALL’, then ‘RESTART’.
Thats it! Your Windows 7 Aero Effects is now enabled!
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