Thanks guys, for the suggestions about stopping programs from running on startup. I now am nearly certain that there is an Adobe product (Contribute) that is causing the crashes. It was the last piece of software that I had added before I started having the crashes. After taking it off the startup list, I stopped having crashes.
Yesterday I used Contribute and I've had 3 crashes since then, even without the program running. Of course, in running it, it put itself back on the startup list. So I've removed it (and only it) from the startup list. If I continue to get crashes, I will remove other Adobe programs one by one.
Time to find a Contribute forum and see how common my problem is...
Thanks again for the help guys. This is an awesome forum with great people.