I don't know why but when I click the start button steam and error pops up like a white page with a big round red X to the left and it doesn't say where I can got to fix it I have tried to find what it says but i am not having much luck it says
unexpected error occured could not load file or assembly then says 'presentation core, version=4.0.0.0 culture=neutral PublicKeyToken=31bf3856ad364e35 or one of its dependencies the system cannot find the file specified details are stored in a text file on your desktop but I can't seem to find it