Bootcamp Failure after Mac OSx Sierra Update

Hi,

i regularly use BOotcamp for Windows design program i cant run on Mac. Yesterday i upgraded to Sierra and when selecting the Bootcamp disk, screen goes black and only a blinking line appears on the upper left corner of screen (as it usually did before), but it never opens the Windows screen and thus bootcamp...

any ideas what i can do? i looked for updates for bootcamp but did not find anything