Ok I took a semester of some computer class where the teacher taught me nothing.

I got this computer and found a bunch of junk on it so I formatted the hardrive, kinda stupid.

I pulled out my Windows 98 Boot Disk and put it in and everything runs fine until it leaves me with a

A:\

And then nothing.

What am I supposed to do now?

Welcome to Bleeping Computer EvilDanny.
We really should have had this post prior to you formatting your computer. Do you have a Windows CD? Do you have the 25 alphanumeric code that goes with the CD? Is there a sticker on the computer that has a 25 alphanumeric code on it? Do you like Linux?

for all your bootdisk needs
try
www.bootdisks.com