Windows 7 pro OS. When a hit a key computer types several different charactors. Also several keys open windows window in bottom left corner. Have run virus protection twice nothing there. When cursor was blinking windows box would flash in and out. Holding down ctrl key and windows key will freeze it but not stop it. Have tried several keyboards and then purchased a new one same problem. When problem first started windows flashed to half screen and then windows start box (Bottom left corner) started going in and out. Any advise on where to look for problem would be greatly appreciated!
