Disabling Windows 7 Taskbar Thumbnail Preview

I'm using Windows 7 Ultimate. Is there a way to disable Thumbnail Preview of open Windows from Taskbar.

- I've Tried Group Policy - It states it is only for vista
- I've tried going to registry:

HKEY_CURRENT_USER\Software\ Microsoft\Windows\ CurrentVersion\Policies\ Explorer

and using Dword:

TaskbarwithoutThumbnail

But none worked.

I don't want to use the delay feature but want to disable it. Any help?

Use this.
Works like a charm on x86 and x64.

I did checked the program earlier but isn't there a simple policy or registry tweak to disable it.