what are you trying to do? redo the registry? If so, type in either:
scanreg /now
OR
scanreg /restore
(note the spaces).... this doens't always work, you'll know because after you chose the date to restore the user.dat and system.ini it will tell you if it failed. Another way is to attrib the system.1st to unarchive it via the -r -a -s -h swich, and then copy it as system.ini (make sure to rename the original to something like system.old). Reboot, rinse and repeat.