My Computer properties wont open. Nor will “System” in Control Panel

I want to be able to open the My Computer properties on my computer desktop and start menu and in the folder but i am unable to do so. the computer loads for a second, but no box appears.
i tried going in through Control Panel but when i clicked System & Display, nothing happened what so ever.
i have performed a virus scna, but there are no viruses.
the little computer icon that represents the My Computer button is no longer visible either. spo what i mean is, the writing is there, but the computer picture isnt
now ive just discovered nothing happens when i right click an empty space on my desktop and click properties!!!