Installing 2nd copy of xp pro on the same partition

[bentcy]

Need some help here!
I have installed a 2nd copy of xp pro on the same drive, same partition. However, I may have mistakenly delete the original setup file (file need for setup) and replaced it with the new setup file while I was trying to install the 2nd copy of xp pro. As a result, I can only boot up my computer with the new copy of xp in which I have no access to all the data and applications that I was using with the 1st copy of xp pro. There are so much important data I can't afford to lose. Please help me and give me advice what I should do now to recover the lost data, or even help me to be able to boot from my original copy of xp pro would be great! thanks in advnace!

 

[bentcy]

I am the one who post this question. I just want to add that I am definitely sure that I didn't format the drive before installing the 2nd copy. Therefore, I have only deleted the data in the hard drive. I just delete the setup folder during the installation process of xp