You will need to contact OneCare customer service to cancel the account -
How to reach support (FAQ) - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2421771&SiteID=2
However, once you do this, your current copy of OneCare will become unsubscribed, probably before the actual renewal date, depending on what support does.
Once it becomes unsubscribed, uninstall OneCare - How to Uninstall Windows Live OneCare
Then, visit the Qwest download page and follow their instructions for installation and activation using your Qwest LiveID:
http://kai03.qwest.com/WindowsLive/MemberCenter/DownloadOneCare.aspx
The Qwest LiveID is the important part in activation - you can actually install OneCare via download from http://onecare.live.com, too, but the activation for your Qwest provided account must be done with the ID that they provide. Contact Qwest for help with activation, if needed
-steve
