Reinstall or add a computer from
http://onecare.live.com - member accounts - add a computer. Activate with your LiveID for your subscription.
Use your Qwest ID to activate - assuming that your subscription is still current. Note that OneCare is at end of life and once your current subscription expires, you will not be able to renew.
See this post:
http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/0000c782-ed1b-4ed3-8afb-87989bb9638c
If you encounter problems with activation, contact Qwest support to determine if you are using the correct LiveID and if your subscription is still current.
-steve
~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~