I fixed it. I noticed a lot of threads with people having the same trouble, so here's how I fixed it. Keep in mind, I'm using Windows 8.1. Your settings may be different.
From the desktop, right click anywhere on the screen. select Personalize
In the right lower corner of the window, select Screen Saver, regardless of what it says (mine said none).
The screen saver window should appear. In the drop down box, select (None) if it isn't already selected.
This is the important step: Uncheck the box that says " On resume, display logon screen"
Click Apply.
Click OK.
After changing these settings on my computer, I let it sit idle for an hour. The desktop remained the whole time. I then watched an hour long show on Netflix. The Lock Screen never appeared.
The down side of this is that you can't use a Screensaver. However, this is a Microsoft problem. The computer should be smart enough to know you're either watching a video or streaming media, and turning off the screen would be a bad thing. Perhaps Microsoft will fix this issue in an upcoming update (hint, hint).