All I remember is someone trying to escape through a window and getting a pitchfork through the (her) back. It was a beach setting e.g. old house/mansion/hotel, and she was trying to get out of the maintenance shed. The only other sene I remember is latter a victim is found a crabs come out of her mouth. From memory the house mansion thingo was abandond

Is it The Mutilator (1985)? http://www.imdb.com/title/tt0124014/

No unfortunately I don't think it is,from memory it was on a deserted island or on a deserted stretch coastline, and it was based around an old abandodned hotel.

Sounds like The Slayer (http://www.imdb.com/title/tt0084694/)

That could be the one I've just watched the trailer on YouTube, and bought it off Amazon, fingers crossed. Thank you very much to all who helped me, it is much appreciated

You're welcome. Hope it's the one.

Thank you Quinn F, it was the correct movie its always good to be reunited with childhood horror, and thank you Slinga3 for helping jog my memory for further info. Thank you both very much.