For the job log not opening, I suggest you the following
1. Update to Internet Explorer with latest version and service pack available.
2. Update to MSXML 4.0 Service Pack 2 (Microsoft XML Core Services). Refer to the following URL to download the service pack.
http://www.microsoft.com/downloads/details.aspx?FamilyID=3144b72b-b4f2-46da-b4b6-c5d7485f2b42&DisplayLang=en
If the issue still persists, download and install service pack 1 for Backup Exec v9.1 onto the media server.
http://seer.support.veritas.com/docs/267182.htm
Further, for the Job Engine terminating during the backup
You may also apply MDAC v2.8 and also install Jet 4.0 Service Pack 8. Stop all third party applications and services first then apply MDAC
http://www.microsoft.com/downloads/details.aspx?FamilyID=6c050fe3-c795-4b7d-b037-185d0506396c&DisplayLang=en
http://support.microsoft.com/default.aspx?kbid=239114#4
You may also try to repair the database using "BEUtility". Refer to following technote for the same
http://support.veritas.com/docs/265180
Ensure that BESA (Backup Exec Service Account) is memeber of "Domain Administrators" and "Adminsitrators" group.
The MSSQL$BACKUPEXEC service is running