I can't believe how easy it was to turn off.

1. Go to Windows Update.
2. Install KB892130 (Windows Genuine Advantage Validation Tool)
3. If the validation check doesn't pass, do the following.
4. In IE, Tools > Manage Add-ons...
5. Select Show: Add-ons that have been used by Internet Explorer
6. Select Name: Windows Genuine Advantage
7. Select Settings: Disable
8. Click OK.
9. Close IE.
10. Go back to Windows Update and it doesn't check the key anymore.

It worked for me. Back to lurkerdom.