Patti,
Please keep in mind that BackupExec 10d was created somewhere in the late 90's to early 2000's. Well before Windows Vista or Windows 7 even existed.
Since then, 10d was been replaced with newer versions that include new features, better performance, as well as supporting new Operating systems. Your existing installation was replaced with BackupExec 11 in 2003 or so, then there was 12.0, then 12.5, then 2010, and 2010 R3 is the most current release. Between each version, there were also a number of major services packs too. So in a nutshell, your 10+yr old product is due to be replaced and its uses, need to be re-evaluated.
That said, new versions of Backup Exec require an actual Server OS to be installed on. You cannot install it on a workstation OS anymore (e.g. Windows XP, WIndows Vista, Windows 7) If you do not have a server on site, perhaps you want to look at Symantec's desktop backup products instead? Or move towards a cloud based/online backup service?