1. The article [Q324767] explains error messages you may receive should they become missing or damaged, and the repair procedures for extracting the files "Config.nt" and "Autoexec.nt" from the Windows media into the "%SYSTEMROOT%\System32 folder". Also, please note the hyperlinks contained in the section "MORE INFORMATION" for additional troubleshooting.
Note: I have not had the need to download and use the utility "XP_Fix.exe" a 140KB file which is described as a program that will reinstall the missing or corrupted Windows XP system files Command.com, Autoexec.nt and Config.nt.
2. Since Windows allocates resources according to its settings and manages devices accordingly, users can change performance options that control how programs use memory, including paging file size, or environment variables - a string consisting of environment information, such as a drive, path, or file name, associated with a symbolic name that can be used by Windows. A user may also use the SET command from the command prompt to define environment variables.
a. Verify that the default items contained in the Config.nt and Autoexec.nt files are present and in the proper order. Example:
SET BLASTER=A220 I5 D1 P330 T3
b. Users can add (new), modify, or remove an environment variable (right-click My Computer, Properties, Advanced, Environment variables) which is established during Setup by some programs, and those by users. Changes are written to the registry (Global Environment Variables) and are usually effective immediately. However, after a change to user environment variables is made, any open software programs should be restarted to force them to read the new values.
3. Running some MS-DOS programs properly might require that you change the system configuration used by the MS-DOS virtual machine, [Microsoft">http://www.microsoft.com/mspress/books/sampchap/6271.asp]Microsoft