Another interesting BUG in Windows Vista, which can be recreated only if you are using "Aero" theme:
1. Type "services.msc" in RUN or Startmenu Searchbox and press <Enter>.
http://www.askvg.com/
2. It'll open "Service Manager" window. Now double-click on any service listed in right-side pane.
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3. It'll open the service Properties box.
4. Just hover your mouse cursor over the "Close" (X) button in Properties box and you'll see the BUG.
The close button will start blinking like a tube-light. Must be a bug in DWM (Desktop Window Manager).

From [BUG] Windows Vista Services.msc Properties Dialog Box Bug - Tweaking with Vishal