First (in general) you can't take drivers from one install to another, they must be implemented for each new Windows setup.
Second I assume you have an internet connection. So go here:
http://www.belarc.com/free_download.html
Install and run and print off the results. This will show what you have installed.
Using the above results, next download the drivers you don't have - Modem?, Network Card, VGA Card, Sound Card, etc and save them on removable media, floppy, CD, memory stick...
In particular write down (and find out) all of the details with regard to your internet and email connections, usernames, passwords, dialup/adsl, POP3, SMTP addresses. This is the very important bit. You must be confident you can get back online because with this information you can get back to the internet & download further drivers etc.
Then away you go, boot from your 98SE CD and follow on screen instructions. It maybe you only need a repair!
If I missed something critical I'm sure one of the other guys will advise.