Self explanatory.
:ffvstr: is crashing after the esrb screen.
Installed the deafult steam program files dir.
Dont know why this is happening?
Is it crashing when you aren't running any mods? If so, you could try validating your files to see if anything was messed up.
If you're crashing when running MA, did you make sure that you installed all of Marvel Adventures inside the "MA" folder?
If those don't work, try running the game in compatibility mode for Windows XP SP 2 or 3.