1) Repartition your drive (if possible from windows) using Partition Magic
2) Make at least 6 GB of HDD Space for Linux
3) Most of today's Linux Installations start from a CD so boot one of them and point it to the proper partition
4) Do not install Linux Boot Loaders , like LILO or GRUB, on to your MBR. THIS IS IMPORTANT if you are a newbie. INstall it on the Linux Bootsector
5) Make sure that you say yes to the setup when it asks for a bootable floppy
IF you have succeedded thus far, come back and we will tell you how to load Linux from Windows Bootloader...
Hope that helps...