Hello,
Refer to the software compatibility list to check if the version you require is tested as compatible with 9.1.
VERITAS Backup Exec (tm) 9.1 for Windows Servers - Software Compatibility List (SCL)
http://support.veritas.com/docs/261695
The version you mentioned, does not seem to be compatible.
Note : If we do not receive your reply within two business days, this post would be marked �assumed answered� and would be moved to �answered questions� pool.
Regards.