in my windows vista basic, i've accidently applied a setting;dat every window becomes active on the incidence of the mouse pointer on it,automatically, its veryy irritating pls help me...

just use your system restore,hit start type in system restore in that bottom search menue then click on system restore..it will show up right above your search box.

Control Panel > Ease of Access > Make the mouse easier to use >
Activate a window by hovering over it with the mouse.