Yesterday I downloaded the base and kern tgz files for 1.4.1 and installed them in /usr/opt, a directory I use to keep from loading /.  Obviously this is a mistake, since when I tried to perform the upgrade I was in single user mode with /usr unmounted.  I aborted the install (2nd mistake).  Now my old /etc directory has been moved to /etc.old where boot can no longer find it.  How to I get back to where I was (a bootable 1.4)?

Thanks.