See below simple steps to do a Symantec BackupExec 2014 installation. Start the installation from the media. Click Install Products.
Click on Backup Exec.
Select the installation type.
Add Licenses. You can add licenses later.
Enter Service Account details here. (You can create separate user account that has local administrative privileges for the backup exec services to use)
Add Remote Computers. You can add remote computers later.
Select Run LiveUpdate to check for available updates, So you will have Backup Exec with latest bug fixes, patches and updates.