What software are you using and what camera. I have heard that sometimes the software doesn't show RAW files because it doesn't know what they are. You would need to update your software. Windows has a RAW viewer utility...but my WIN XP can see RAW files just fine.
What about the software that came with the camera? That software would surely read your RAW files.
Just to be sure...did you set the camera to record raw files? Because if you didn't...there would be no RAW files.