So I get my third dual head card in the mail the other day and after two days of patient waiting I took the plunge to install it. Well, to make a long story shorter, it took me all day to get working. Typically you just add the video cards and voila,...

To install the MouseWheelFix on a 64 bit edition of Windows you need to place the registry key entries in the 32 bit node of the registry. This means the registry keys should be HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft... instead of HKEY_LOCAL_MACHINE...