Melodyne question

I use X3e and everything was great. I tried to use guitar rig 4 for the first time. I had to register it and download an update. I proceeded to use it and I started to get blue screens when I used Guitar Rig 4 or Melodyne. I was hoping a re-install might help. Can I install X3 right on top of itself or do I need to uninstall it first.  Thanks , Dan

Thanks! You're the best!     Dan