DIAGNOSIS: Ran Youtube video of a screen tearing TEST PATTERN at 60fps, and one at 29.97 fps.
Tearing at 60 fps, but 29.97 was miserable. . .
When I closed BTV, and AERO came back on, 29.97 fps was error free.
PROBLEM: Autoswitching to Basic from Aero results in screen tearing.
RESOLUTION : Turn AERO back on.
(I could not find any means to prevent AERO autoswitching to BASIC)
Open your registry, find the following location (you create the Restart Aero and Command folder).
Create a new string in the Command folder, and leave it named (Default), then under Data, type the following:
CMD /C NET STOP UXSMS & NET START UXSMS
That adds the option to Restart Aero to the right click context menu when you're on the desktop.
. . . .
WORKS ! ! ! ! !