With all scans you will be able to keep an archive of scan reports as well.
For this article I am installing it on Windows Vista Ultimate 64.
I would imagine the process is very similar in other versions of Vista and XP.
Since this is my first experience with Windows Live One Care I want to test everything out during the 90 day trial.
Another thing I noticed right away is several balloons and other messages pointing out what One Care believes to be lacking security on my system.