Hello,
Backup Exec cannot be installed on a 64 bit OS
You may refer to the following technote
(title) Backup Exec for Windows Servers cannot be installed on 64-bit computer systems
http://support.veritas.com/docs/247784
(title) Symantec Backup Exec 10d (10.1) for Windows Servers - Software Compatibility List (SCL)
http://support.veritas.com/docs/278254
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Thanks.