Here is not Backup Exec room but System Recovery room. I recommend to post to below.
Regarding Backup Exec, if you would like to only restore some files in BKF, it can be restored on Backup Exec 20.6. You can download a trialware for BE 20.6 from below.
However you cannot install BE 20.6 on Windows 2003. BE 15 or eariler supported Windows 2003. You can download BE 15 from below. You can use it for 60 days with no license.