Thanks for your help, all. It still came up an hour off this morning. I just reset the clock manually, while still leaving it checked as being EST. Strangely, some things were correct, such as time stamp on emails, and I think even the forum time. Likely just one of those odd things that computers like to do once in a while just to keep us on our toes.
And yes, I know all about changing the profile settings twice a year to accommodate the changes between Standard and Daylight Saving Time.
I'm using Windows Vista Home Premium.
So, serb1389, what did you end up doing about it?