After I have downloaded the 814078: Security Update, it
will start to install normally, but then it will show a
box which asks me to insert the disk which contains the
file "jscript.dll". What do I do?

use the windows search program, tell it to search for
jscript.dll if windows finds it point the installation
program to it. if not, on WinMe, its in Win_11.cab check
your installation disk, or the folder on your computer
where the Windows installation files are stored. Search
through your cabs till you find it. copy it to your
desktop, but keep the cab open. point the installation to
your desktop, and your set. other files may pop up. do the
same for each one. delete the files from your desktop
after you are done. the installation program copies them
to the appropriate folders. Could be a long proccess, 1
file at a time.