Well, Windows Live OneCare is finally off of the last system in my home. My wife had been using it under Windows XP. Recently OneCare downloaded an "update" that made it totally unuseable. Using Microsoft's OneCare repair tools (kind of says something about the product when they have repair tools, eh?) and doing a total uninstall and reinstall could not get OneCare back in operation.
So, I installed Symantec's Norton 360, which offers everything that OneCare does. Norton 360 also has many additional features over and above OneCare, such as regularly tuning up your PC.
I use Norton 360 on three of my PCs and find it to be an excellent for securing and protecting your PC, especially if you are a heavy Internet user.