Issue w/Win 2K

Hello everyone:

Another issue I am having with Win2K, and will appreciate assistance to troubleshoot.

I have installed a program that used to work fine on my laptop. Now though, I get the following error message when I try to start the program;
“C:\winnt\system32\autoexec.nt. The system file is not suitable for running MS-DOS and Microsoft Windows applications. Choose “close” to terminate the application”. (Only options are “close” and “ignore”. Nothing happens when I click the latter.

Can anyone figue out what’s going on here? All assistance appreciated. Thanks!

John