Hi,
As a preliminary step, please upgrade to Backup Exec 9.1. It addresses many issues and enhancements from an earlier versions and Build of Backup Exec v9.0. Refer the following technotes:
Title: VERITAS Backup Exec (tm) 9.1 for Windows Servers revision 4691.1 (Single .ZIP download)
http://seer.support.veritas.com/docs/264658.htm
Title: VERITAS Backup Exec (tm) 9.1 for Windows Servers General Information
http://seer.support.veritas.com/docs/262414.htm
Note: 1. BEWS 9.1 is a free downloadable upgrade inclusive of previously installed agents and options from Backup Exec 9.0 for Windows Servers agents and options.
2. Update all agents/options on all remote systems after the upgrade.
Please install Backup Exec 9.1 Service pack 1 after upgrading to 9.1 from the following link:
http://seer.support.veritas.com/docs/267182.htm
Please install the latest drivers from the following link:
http://seer.support.veritas.com/docs/273853.htm
We hope this will help.