The Gateway Restoration disk should boot and restore the OS as it was installed by Gateway. You would need to change your bios to boot from the CDROM. It would also be a good idea to read the Gateway documentation as it surely would tell you how to run the restoration.
The Win98 Se disk should also work fine. If it is a bootable disk, (some are, some are not) then again you would need to change the bios to boot from the CDROM... then all you have to do is follow the prompts. If the Win98 disk is not bootable, then the procedure is to boot from a Win98 flopply like you tried before.
What you cannot do is try to swap between the Gateway and Win98 disk while under the same installation. The paths for the installation cab files are not the same and is possibly why you got so many missing files errors... at least I'm sorta assuming you swapped between discs at some time during your install when you were having troubles.
Can you really help? I will be here for the rest of the day and will return on Monday
Yes, I believe I can help you. However, it will take some time. As long as you're patient and not in a rush, I'll do whatever it takes.
You need to answer a few questions so we can have a base line...
Where are you in the install?
Is the Hard drive partitioned/formatted the way you want it to be?
Do you need help with partitioning/formatting?
If the drive is already formatted, are you ready to commence the install?
I have written a short summary (attached/password protected) on how to install Win98. It's basically the same as the posted link in this forum, except for a few changes. Note that this is off the top of my head so hopefully it's not too confusing. If you follow along with it during the install, and run into any problems, just PM me, or post back to this thread. Please read over the summary and see if it makes sense to you. Note also, that I have not included any screen shots, so if you run into a screen that you're confused about, just visit the Win98 install linked in this forum to find notes on the particular screen. Also, Please do not repost the summary as it is not tested and I don't want others to get confused by it if it doesn't even work for you. I've PM'd the password to you. Thanks.
One more thing... please take the time to disconnect every piece of peripheral hardware connected to the Gateway computer before attempting the install.