We have a Windows NT client running 5.1.7.0 client code that cannot
perform scheduled backups. As far as I can tell, the underlying problem
is that all attempts to write the encrypted password to the registry have
failed. Attempts to create or update the scheduler service generate
messages about errors storing the password. When the service is started
it stops almost immediately, reporting error 1067. A manually triggered
backup prompts for a password and writes the following to the client error
log:

WritePswdToRegistry(): RegCreatePathEx(): Win32 RC=2

along with a number of similar messages about problems reading the password.
The system administrator for the client has tried all of the following:

Removing and reinstalling the service
Verifying permissions on files and registry keys
Using different administrator IDs
Using different TSM passwords
Removing the client software, removing all registry keys that appeared to
 be related to TSM, and reinstalling the software

None of these have resolved the problem. Does anyone know of a fix for this
problem? Failing that, does anyone know what registry key the password is
stored in? Knowing that would enable us to undertake a more focused search
for problems with registry permissions.