Some questions like "Dualboot some GNU/Linux distribution (mostly Ubuntu) with Windows 7/8" are being asked more than five times a day and are broad in their nature, so I start to think about marking them as duplicate, but then have some specific "subquestions" in it like "with this special laptop" or "this special partition layout" so that an answer won't be useful for anyone other than the one asking it and a broad answer or similar answer won't help the one asking it because of their technical knowledge often being not good enough to apply a similar answer to their case.
So how should I deal with those kind of questions? Mark them as duplicate, try to link some reference material they can read or leave the answers as they are in a state they won't likely get an answer? And how could it be prevented that those questions keep reoccuring all the time?