Dual boot , win 2k and win xp

Hi,
I have messed up with my system again. So i am
starting again right from boot installation.

I want to make my system dual boot.
I am having PC with p4 and 40 GB HD.

I want my system to have 4 partitions.

with windows’ 2000 on c: andWindows XP
on d: . Both the OS should have NTFS and
I want the Files to be seen from both the
OS. How to proceed with this. Could anyone
tell me step by step .I could not sleep for
two days because of this.
Please Help.

Vijay