Yeah, same thing here..while i was installing i saw a error quickly then nothing..
it prepares to launch then nothing
edit:
well, this seems to be a problem with .net framework, dude.
I have .net 4 here, using in a windows 7 and i cant have 2 or 3 versions of .net because only v4 is for 7...So everybody running USB in a windows 7 with .net framework v4 is having the same tissues, I THINK
MEH, thats kinda sad