One Care cannot be installed on Windows 7 but you can use the One Care backup restore tool to restore your backups -
http://social.microsoft.com/Forums/en-US/onecarebackupandrestore/thread/e5d686c8-762b-4b22-bc08-bfb93f911e57
Jim
Microsoft MVP Consumer Security - Forum Moderator - Live One Care - Live Mesh - Microsoft Security Essentials