Missing file

Since a recent unsuccessfull attemp to install the Norton
firewall, my system comes up with the following DOS
message while booting up:

"Cannot find a device file that may be needed to run
Windows or a window application.

The Window registry or system .ini file refers to the
device file, but the device no longer exists.

If you deleted this file on purpose, try to uninstalling
the associated application using its uninstall or setup
program.

If you still want to use the application associated with
this device file, try reinstalling that application to
replace the missing file."

C:\WINDOWS\SYSTEM\VSHINIT.VXD

Any idea which application might be cause of this problem
and how I can fix the problem.

Thank you