Thank you, this also worked for me 🙂
I’m also having issues enabling Aero Peek from a standard user account –the option in taskbar properties is checked but greyed out.
Visual effects are all on, and all the other Aero features work.
From the Administrator account, Peek works, and the checkbox in taskbar props is enabled.
I tried benua-J’s advice, but nothing appears to work. Anyone know what the relevant setting in the policy editor might be?