Setting up a second Windows XP

Hi,
first I want to apologize for my English. And second, I would like some help.
Here`s the deal. Recently, I unistelled my system, and tried to install it again. My computer keeps shutting down during installation. So I swapped hard drives with my second computer, but the second computers reports that my hard drive has a problem and that I need to remove it. So, I put back second hard drive on second computer, as master, with my first hard drive from first computer, as slave, (the one that the second computer couldn`t read) and now it works perfectly. So, I was wondering how to install Windows on my first hard drive without deleting the system from second, master, hard drive. Please answer if you understood anything...
 
Please indicate the size of your 1st and 2nd drive.

Do you want to wipe out everything on your 1st HDD?
 
Fist one is 160, and the second is 80 GB. I have already saved everything I needed, so it doesn`t matter if I lose all data from the first one. And, yeah, both are segmented in two parts (like C and D)
 
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