What version of Lightroom?
3.6 but when i check for updates is says "Your software is up to date. No updates are available at this time."
If you try to reinstall lightroom he will get the most current version what do you think?
That message is correct. Version 3.6 is the latest version of Lightroom 3 so there are no updates to that version.
However that's not the whole story. You need to pay to upgrade (not update) Lightroom to version 4 or 5.
The Canon 5D Mark III was first supported in Lightroom 4.1. That camera will never be supported in Lightroom 3.
So you need at least version 4.1 but Adobe only sells version 5.
So your best bet is to pay to upgrade to Lightroom 5.7 so you can open 5D Mark III Raw files directly into Lightroom.
Or, you can download the free Adobe DNG converter, convert all 5D Mark III Raw files to DNG format then edit the DNGs in Lightroom 3.6.
Thanks John, my further research led me to the same conclusion. Thanks again everyone.