I guess MB means motherboard. If that gets too hot you can trow away your PC..
I would clean your PC like hell, blow away any dust you may see. Also, Try starting your PC while you keep the case open.
Also, What's more a concern. If you look at my screeny, you see 3 fans blowing (3 having >0 RPM) You only have one, and that one is going rather slowly.. Try cleaning that..