it sounds like your partition you wanted to install linux on is to small,
I hope you have 1 disc and 2 partitions 1 win and 1 linux?
if you have 2 drives you are in for a ton of trouble because of grub the boot loader,
if you can use lilo instead you should because even it's age it is much more reliable.
grub allmost allways gets confused which disk to boot,
try to get hold of norton partition magic from piratebay
it's a windows program you can run from windows or boot from cd,
the iso version is best because you can run it from cd,
the other only work from windows.
it's very easy to use because everything is in a nice gui,
from there you can change everything,
and resize your linux partition if it's to small.
if grub is stuck in MBR you can boot from a start floppy,
and run the command fdisk /mbr