Like Rick has said it looks like it would be a WB issue there. Shooting in RAW is going to give you the benefit of being able to adjust the white balance in post processing. You can still do this with a JPG but not it's not as good as doing it through RAW. If you are having trouble with opening your RAW images you can always give Raw Therapee a try, or download a trial version of Adobe Lightroom or Bibble RAW.

Cheers