I also see this error Error -1: Getting Device IDs (num)
Anyone have any ideas as to what I can to do fix this?
Just re-read your post, that error i think is to do with your graphics card.
Try the latest version of cgminer and see what you get from that. cgminer is what guiminer uses underneath anyway, but iam not sure of the what version it uses.
So nothing I did worked at all. Even re installed windows re did everything and nothing fixed it. Intended up boot and nuking hard drive with DNB and re installed everything and it worked.
Who knows what I screwed up originally but oh we'll