The following command set appears to be able to perform a major refresh/upgrade/update to Sharepoint:
C: cd \Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\Bin stsadm -o provisionservice -action stop -servicetype spwebservice -servicename "" stsadm -o provisionservice -action start -servicetype spwebservice -servicename "" psconfig -cmd upgrade -inplace b2b -wait -force
I found that after running the above, I had to add binding ‘http://companyweb’ in IIS, on port 80.
In addition, the following pages seem to contain info for use when companyweb is not working:
http://davidcmoisan.wordpress.com/2009/05/08/sbs-2008-solving-four-sharepoint-problems-at-once/