Make a boot floppy, copy the missing DLL to it, boot you dad's machine with the floppy, copy the file to the proper place, reboot without the floppy.
dll files to download for free
Yep, and while your at it, reinstall Nortons, that should take care of those other errors.
Many times when you've inadvertently deleted system files the fix is actually no more complicated than replacing the missing file. If you've got the missing .dll, just try copying it back into the windows\system folder and reboot.
http://www.dll-files.com/dllindex/dll-files.shtml?wininet
So, it sounds like it is something easy to fix. Thanks to all of you!