Windows 7: Screen tearing AMD HD 6570 Catalyst 11.11 after SSD install

Hello,

I installed a SSD Drive (Samsung 470 120gb) in my Dell Optiplex 760 SSF and reinstalled Windows 7.
I first installed the old Catalyst 11.9 driver, but when I saw that my windows were tearing when I dragged one over another, I removed the driver and installed the new 11.11 version.

The problem still exists.

Problem:
When I drag one window over another, either the window thears and leaves lines or rather a shadow for a second, or the shadow is alltogether grey and disappears when I stop dragging the window.

My config:
Dell Optiplex 760 SSF
Intel E8400 2x3ghz
6gb ram
Amd HD 6570 1gb
Samsung 470 120gb SSD
Samsung HD204UI 2tb
Windows 7 Enterprise 64bit
LG 27" 1920x1080
Asus 24" 1920x1080

Before the installation of the SSD and reinstallation of Windows 7, I didn't see this problem.
I have a dual screen setup, but the problem stays the same when I disconnect either one of them.

I made a quick and bad video with my phone:
www.youtube.com/watch?v=jOS8i8PTvjU

Maybe someone has a solution for this,
Greetings

I just solved the issue:

Aero wasn't activated, for whatever reason.
After enabling Aero, everything is fine again.

Greetings,