I received a missing file error (black & white screen upon Windows Startup) after installing Win 98 2nd Edition Updates. After searching the Web I noticed others had the same problem. Installing it corrected the error.
Optional method of obtaining this file.
You need the Windows 98 CDROM !
This file is located on the Windows 98 CD in \WIN98\NET9.CAB
Type the following line, replace the ? with your CDROM letter
extract /L c \windows\system ? \win98\net9.cab mssp.vxd
If you have the CAB files on your HD, then shell to DOS, change to the CABs directory and type the following line
extract /L c \windows\system net9.cab mssp.vxd