I've successfully used Macrium Reflect Free with XP, Vista, Windows 7 and Window 8/8.1.
Can't say if you're doing anything wrong unless you tell us what you are doing. :) How about a step by step after launching Macrium until you get to the problem screen? And a screen shot of that one should help.
Can't say if you're doing anything wrong unless you tell us what you are doing. :) How about a step by step after launching Macrium until you get to the problem screen? And a screen shot of that one should help.