It is a testament to the intransigence of the human spirit that for the last 6 years of my life I have right clicked on that little icon on my taskbar and chosen to remove the "Language Bar" from the taskbar, only to have it pop back up at some later point for some unknown reason. Lather, rinse, repeat this cycle every few days.
Today I finally figured out how to turn off that stupid thing. 🙂
In the Regional control panel, on the Languages tab, click Details, then click Language Bar, and turn that sucker off.
Ahhh, sweet relief...