If your computer is running windows, you might be able to get the Raw Codec from Microsoft. Do a google search to see what's out there. I know that my Windows computers can open Nikon NEF files, natively in Win 10, but I had to download a codec to do it in XP, Vista, and (I think) 7, though it's been a while.
ON the Vista laptop I'm using now, I can open NEF files directly into free software editors like Faststone and Irfvanview, and they in turn will do the conversion to other file formats.
Depending again on the camera, some cameras (e.g. Nikons) can do Raw to JPG conversions in the camera. The Nikon software such as View NX2 or Capture NXD will also read Nikon's raw files and do the conversions. I imagine that Canon has something similar.
If all you want to do is convert Raw to JPG, I'd look for the windows codec first, and if that works, the quickest program I think for doing conversions, including bulk conversions, is the freeware program Irfanview. It's very fast, and has a pretty well organized set of settings for bulk conversions.
In fact, before you go too far, I'd try downloading a copy of Irfanview, because I think it's possible that it may include whatever codecs are required, or give you a link to them. If so, you may find it can read your Raw images, and even though you probably want to edit them elsewhere, you can convert them to JPG or TIFF there.
