Pam -
Maybe this will help (since you are admittedly new to the world of DBA)
You are probably actually using the Windows (well, sort of) DBA Classic because I don't think the true DOS version was available after version 99.2 in 1999. If you load the program and the splash screen is a guy in a red jacket with bad hair standing on a box, that is DBA Classic. If that is what you are running, you can click Help - About and get the specific version, which can be helpful to us when you ask questions or report issues. It is likely 2002.4 or 2004.1 but it could be something older. It may not be supported by the folks at DBA but it is certainly supported by IS Tech Support.
The versions other people here are referring to include DBA Classic with IS Tech Support updates (which is what you have but with updates and bug fixes we have provided over the past 6 years) or Evo-ERP (also called Evo) which is the same thing but with a true Windows based interface enabling functions such as email and enhanced forms editing.
www.istechsupport.com/evolution.php for details.