Thank you all for your help! It's much appreciated, but I've fixed it in messing around with my settings! I went to Control Panel, Display, Settings, Advanced, and S3Overlay and hit "Default" and they all corrected themselves when I had a video open. I've closed and reopened the videos again, and they're still working. Whew! What a relief! Thank you again for your help! It's much appreciated, and I didn't feel so lost and hopeless in my PC troubles. Thank you, thank you all again!