Gary, I understand that one of the nodes has a working BE 9.1 up and running !? - so until the problem is solved, please run the backups on this lokal BE instance. Yes, it is not failsave, but at least it will be a backup of all resources, incl. the clusterd resources.
(BE does not need to be clustered in order to be able to backup a cluster.)
Besides, I do not know what you have done with support, but as nothing else helped so far, try uninstalling manually.
Check in control panel, add remove progs, whether there is any VERITAS product or MS SQL MSD listed. If yes, try to uninstall (assuming you only had BE and no other MSD running)
Go to the cluster node causing this trouble. stop any BE services incl. MSsqlBKUPEXEC (if there are some)
Go to the registry and delete all entries for HKEY_LOKAL_MACHINE\software\veritas (assuming that there are no other VERITAS products running on this node)
Delete the registry entries for the SQL instance of BE
HKEY_Lokal_MACHINE\Software\microsoft\microsoft SQL server and MSSQLSERVER
(WARNING, insure you have no other SQL instance installed)
Delete all service entries for BE and BESQL found in the registry - if there still are some.
Delete all BE directories in the file system as well as program files\mssqlserver entries.
Delete all BE entries that you can still find on the shared disk, where BE was running prior to the problems.
Delete the disk resource ment for BE cluster in cluster admin.
Reboot the node.
move the shared disk to the node just rebooted and try a new lokal install to this node.
If it works, go on running the cluster config wizard, after regenerating the Diskresource in cluster admin.
How did it work. ?
If the MSDE SQL gives you some trouble uninstalling, read this:
http://support.microsoft.com/default.aspx?scid=kb;en-us;320873
Hope this helps, but no guarantee for sure ....
regards
uz