This was the issue, I went into the bios and changed the boot order back to the correct drive. Thanks for your help.

Thanks for the advice, I will try that tonight when I get home.

I do have multiple drives in the computer, it's possible that one of them had a prior windows install. I had not even thought of that possibility; I will unhook those drives and see what happens.
...

About a week ago I installed the free windows 10 upgrade on one of my home PC's, everything went good and installed perfectly. I woke up this morning and the computer had reverted back to Windows 7...