Thanks for reviving this actually, as I think I may now have the solution (apologies to the OP, I forgot about this thread). Now that I work in IT, I've encountered something very similar to this. Restart your PC and go into the BIOS (usually upon start up, keep hitting F2, though the key may vary). Depending on your BIOS, you may have to go to a "configuration" tab to find what we're looking for, but regardless, we're looking for something that says something along the lines of "display". Once you've found something that says something along those lines (it might say "video" instead, for example) go in and make sure that dedicated graphics is enabled. If "Nvidia Optimus" is listed as an option, I think you should enable that as well, though that's just for power saving reasons.
If either the OP or robnelovera has trouble navigating the BIOS, try taking screenshots with a smartphone or something and uploading those screenshots to imgur or something like that, where you can then link us here.