You need to install OneCare on the new computer and then use the restore wizard to restore from another computer.
Alterntively, you can manually extract the data from the .zip files using WinZip or other 3rd party compression/archive program and rejoin any large files that were split by OneCare's backup function using a rejoin utility such as this one -
http://www.freebyte.com/hjsplit/
-steve
Microsoft MVP Windows Live / Windows Live OneCare, Live Mesh, & MS Security Essentials Forums Moderator