The way I would do this is on another computer that has One Care installed choose a custom restore, select "restore files from another computer" and restore the files to a folder on your desktop. Copy and paste the needed files to a flash drive or an external drive then copy and paste them in Windows 7. If you don't have another computer with One Care installed you can manually extract the backups using a utility such as WinZip and a file joiner
http://www.freebyte.com/hjsplit/ to join any split files.
Jim - MVP Windows Live - Forum Moderator - Live One Care - Live Mesh - Microsoft Security Essentials