As I said, I don't have Win7 so I don't know what to recommend. However, on that thread I linked to, the OP mentioned that he used a tool called "Xfire" and it solved his problem.
Perhaps if MS gets enough complaints they'll put it back the way it was. The new clipping tool is supposed to be an improvement but it seems that it will not grab game images.
BTW, if you do get it working, it's much faster to press the "Insert" key in MoBo to load the image from the clipboard (rather than doing it the slow way with menu Map-Load).