I\'ve uninstalled VS11 using the the windows installer, and deleted just about every registry key I could find relating to it, but it still pops up with this when I try to r
For me the final visual studio 2012 wanted to install into the same path as the (uninstalled) beta. I deleted most of the stuff in HKLM that had an exact match for the setup directory (ending with a \ e.g. C:\VS11Beta\) and then the setup let me choose again.
Probably not a solution for the OP(M:\Program Files sounds too generic to delete), but perhaps for others with this problem.