Okay, so I've been playing Rocksmith 2014 for a while now and just recently I had to reset my PC. I reinstalled Rocksmith and everything was fine, but when I put one of the CDLC's in it crashes my game when I try to play the song. The weird thing is that I can play every other song on there but the one I want to play. I don't know if I need to reinstall again or what. 

No expert here. But some CDLC songs do that. you might be trying to play a bad song. When i first started with CDLC's , everytime i restarted the game I lost all progress. it turned out to be one of the custom's. I dumped them all and started loading them a little at a time until I found the one causing the issue. I suggest you remove that song and see if there is a newer 'fixed' version. 

But it does this for every cdlc

Did you reinstall you Direct X dll?

 

Posting from a phone but revisit the help section and make sure you put the DirectX dll back into the Rocksmith folder.