It sounds like there may be a problem with other software taking ownership of the CD writer. This can be software such as InCD or DirectCD by Nero and Roxio, or it can be some other utility.
You should contact support to get help in identifying the cause of the problem.
How to reach support (FAQ) - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2421771&SiteID=2
However, if you are satisfied with an alternative backup solution, you can turn off backup in OneCare and get back to green.
Open OneCare
Click Change Settings
backup tab
Click change settings in the lower left
Make sure that the first screen for Centralized Backup has "No Centralized backup" selected
Click your PC on the left.
Uncheck the selection for "Turn on backup for this PC."
Click Next and save the revised plan.
-steve