That is precisely the problem. My computer will not reinstall the backup discs unless it has One Care installed. One Care won't install. I get a message that backup was produced under One Care and must have One Care to reinstall. The proverbial Catch 22 or the familiar loop operation that requires wire cutters to solve.
The tool is a program to allow you to access the OneCare backups without fully installing OneCare.
http://social.microsoft.com/Forums/en-US/onecarebackupandrestore/thread/e5d686c8-762b-4b22-bc08-bfb93f911e57You should still run the cleanup tool as that will usually resolve the error you are encountering when attempting to reinstall OneCare.
In the worst case, you can access your backups using WinZip or other 3rd party utility and extract the zipped files. It may be painful if you have many files to restore and it will be very manual.
If OneCare has split a large file into multiple .zip files, you will need to extract all of the parts, rename them with extensions .000, .001, .002, etc and use another (free) tool to rejoin the parts:
http://www.freebyte.com/hjsplit/Alternatively, you can contact support for help with any part of this problem.
How to reach support (FAQ) - http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/30400b52-7f26-4ba0-bc18-17e305329d90
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