Hi Aaron,
By default, MSDE installation is a part of Backup Exec installation and this database can not be shared by any other application. When the MS SQL MSDE Engine is installed it runs under the "Local System Account".You can provide the user name and password for this service to run but its highly recommended that the MS SQL MSDE service must run under the "LSA" account.
The default SA password for the MSDE SQL instance of Backup Exec is a blank password (i.e. no password). Please refer the below mentioned
technote on how to change the SA password.
http://support.veritas.com/docs/254374
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It would be also good, if you upgrade free of cost to BE v9.1:
http://seer.support.veritas.com/docs/264658.htm
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