The virus was spread by e-mail as an "executable" (.exe) file capable of running on Windows 95 and 98 operating systems.

CNN: FROM THE WEB

But this reply will have the "Navidad.exe" file attached.

CNN: 'Navidad' computer virus poses moderate risk

Look for a line in the file containing mscdex.exe and delete everything up to it, so that the line begins with mscdex.exe. (You can remove all subsequent lines from the file, too.) Save the file.

CNN: Top 50 Windows tips