ok guys got it working for me at least
here are the steps:
1 do the regedit thingy, (renaming the cd drive etc etc)
2 disable optical drive
3 load the "real"(the one you used to install the game, not the poseden one) image through Dtools (mine is v4.08)
4 launch YASU
5 autorun the image, clik on play
works for me... dont ask me how it works i was just trying and trying and it finally worked
enjoy
edit: my version of R6 is updated to 1.01 and i didnt set the compatibility mode to windows 2000
edit: missing a step will get you the usual error but if u then do everything right and re-launch you ll notice that it wont work.... the thing is that u can play one game per windows session... strange huh? each time i want to play i have to restart my box before that. so if u **** up u have to restart, and then repeat step 3 and 4. well u have to do it everytime u want to play, so if something doesnt work just restart then launch YASU, autorun etc