soild works 2014/2015 crashs at loading task planes

Does any one know how to fix this? Every time I start up now it gets to loading task planes and then  crashes. It used to work fine a mouth ago the only thing I did to my computer was merge two hard drive spaces  and install mathcad prime 3.0. paid version. I tried uninstalling and reinstalling but no avail. 

SolidworksGeneral