Reply to Trouble with Traktor 2.0

Greetings fellow DJ's.

I am having a few issues with Traktor 2.0 that I would like to solve before I consider upgrading from a Kontrol S2 to a Kontrol S4. I started having these issues after unsuccessfully attempting to upgrade to Traktor 2.5

Thanks in advance....

1. When I open Traktor from my desktop, I get the following message. "Could not read the default settings file for audio auto configuration. Please rerun the installer!" To the best of my knowledge (which isn't much) I attempted to rerun the installer but nothing happened.

2. Somehow the files underneath the sample decks have turned red. I can no longer use the Preperation, Demo tracks, Demo loops, or Scratch samples files and I have no idea why.

3. I deleted all of the effects that Traktor comes with before I realized I wanted them. How do I get them back.

4. I am believeing about just starting over from scratch. Should I just wipe my computer clean of Traktor than try again now that I am not a noob anymore?