Error message when you try to activate Windows Live OneCare: "Cannot Complete Request: Your token cannot be used for this service. Message 7104"

SYMPTOMS
When you try to activate Windows Live OneCare, you receive the following error message:
Cannot Complete Request: Your token cannot be used for this service. Try using a different token, or choose another service. If you get this message more than once, report it as a recurring problem. Message 7104

CAUSE
This problem occurs if you have the beta version of Windows Live OneCare installed. However, you try to activate it by using a retail product key that is used for the retail version of Windows Live OneCare.

RESOLUTION

To resolve this problem, uninstall the beta version of Windows Live OneCare. Then, install the retail version of Windows Live OneCare. To do this, follow these steps:
1. Follow the appropriate step:
• In Windows Vista, click Start , type Appwiz.cpl in the Start Search box, and then click Appwiz.cpl in the Programs list.
• In Windows XP, click Start, click Run, type Appwiz.cpl, and then click OK.
2. In the list of installed programs, uninstall Windows Live OneCare, and then restart the computer.
3. Visit the following Windows Live OneCare installation Web site, and then click Download your 90-day free trial today:
http://onecare.live.com/standard/en-us/purchase/default.htm (http://onecare.live.com/standard/en-us/purchase/default.htm)Note If you have the Windows Live OneCare CD, you can install Windows Live OneCare from the CD.
4. Click Install Windows Live OneCare, and then follow the instructions that appear on the screen.