Donot Forget To "Disable" UAC in WINDOWS 2008 R2 While installing Netbackup!
Always remember to DISABLE UAC (User Access Control) while installing Netbackup Server or Client on any Windows 2008 R2 Machine
As its mentioned in Netbackup Windows Admin Guide:
Note: To install NetBackup on Windows 2008/Vista and
Windows 2008 R2/Windows 7 UAC-enabled environments,
you must log on as the official administrator. Users that are
assigned to the Administrators Group and are not the official
administrator cannot install NetBackup in UAC-enabled
environments. To allow users in the Administrators Group
to install NetBackup, disable UAC.
How to disable UAC ?
4.Change User Account Control Settings