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@spenccn wrote:

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I used the original install disc that was given when we purchased the license...

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It is really strange, because AFAIK you cannot install AutoCAD 2013 using original installation, because the old installer doesn't work on Yosemite.

Some users reported here that were able to ununstall AutoCAD 2013 on Yousemite after they downloaded and installed trial version of AutoCAD 2015 for Mac. You can try this solution, maybe it helps you too.

If you removing will be successful, than you can download new installer from the link I provided in my previous post and install AC 2013. Than you can remove AC 2015.

Maxim