I've been at it now going on day 3. I think the file that's not validating is the D3DX9_42.dll.new. I can play on my MacBook Pro, but of course the CDLC comes up with just those speakers and won't let you play those songs. Now on my MSI, I keep getting Rocksmith2014.exe has stopped working at the startup so I can't play anything. I've uninstalled and reinstalled Steam and Rocksmith 2014 a dozen times with no luck. But I am making progress. Anyone has the solution, please, I'm all ears.