Probably the best option (long term) means $$$'s and that is to buy a CDROM (Backpack?).
Other option - whilst you still have an OS installed - is to laplink (or network) to another system, copy over the '98 Folder off a '98 CD, to the laptop HD and re-install from there. Problem is that you are going to need a second partition (on the laptop) in order to store (safely) the '98 Folder, whilst you reformat the c: system partition?...
If you don't have a second partition, but have space enough to allow one, then use PM5x/6x to shrink the current single partition, thus allowing you space in which to create an Extended partition; format it FAT16 (definitely FAT16) and store the '98 Folder there.
Reason for FAT16 in this case? Allows access to it (and the '98 Folder) from a DOS boot-disk as well as a '98 boot-disk... and is probably safer - certainly allows you more options...
You could make this 'new' partition large enough to store other critical files/data too??? At the least make it around twice the space needed for the '98 Folder (so you have a 'little' to spare...).