XP has virtual dos emulators for running dos apps. The usual one used is cmd.exe---the 32-bit emulator/virtual machine. The alternate is command.com--for older dos dinosaurs. You can start a command-prompt session, by Start menu/Run / cmd.exe (or command.com).
Use this as a guide. It is useful.
Running Nonnative Applications in Windows 2000 Professional (applies to XP as well)
http://www.microsoft.com/technet/tr...chnol/windows2000pro/reskit/part8/proch36.asp
The XP system does not use the old Config.sys or autoexec.bat. You may setup your own or use Config.NT and Autoexec.nt. (in \windows\system32 or yours may be at \winnt\system32 ). Thus you need to research the dos-startup files you had before, and transfer their commands over to the .NT set, as appropriate.
Troubleshooting MS-DOS-Based Programs in Windows - Article ID 314106
http://support.microsoft.com/default.aspx?scid=kb;;314106
Using Program Information Files (PIF) (like we used to use in Win9x/Me) is a good idea.
Bring up Help and Support (from the XP menus). Search on "create custom startup files for an MS-DOS-based program".
First, setup a shortcut to the program. Then go thru the "properties" of shortcut to specify what it needs.
Look up in XP's Help and Support Center, in its search box:
"Set up two shortcuts for an MS-DOS program "
"Create or change a PIF"