Awwww...it's not *NEARLY* that bad to format and re-install. Since it's a second system and you don't need what is on there, this is a great opportunity for you to learn and expand your skills. After you've done it, I bet you have no qualms about doing it again. You may want to ask a friend to help out the first time if you know a local "geek". :)
Here's what to do in a nutshell:
1) Go under start>settings>control panels>system and write down the hardware you have in your system (just in case 98 has trouble with a driver, etc).
2) create windows 98 boot disks. Here's a guide
http://www.computerhope.com/boot.htm
or you can just get one from www.bootdisk.com
3) format the c: drive (type format c: at a dos prompt). You can dothis from your boot disk or from the win95 dos mode.
4) Put your boot disk in the floppy drive and reboot (most boot from the floppy first. You may need to set this in the bios though).
5) Type setup and follow the win98 prompts to re-install.After it finishes, check your devices and make sure they were detected and set up correctly. If not, get the correct drivers and try again.
It should go pretty smoothly...but if you have trouble, don't sweat it. Look at it as a chance to advance your knowlege and try again. Don't hesitate to come back here for help!
Good luck!