Reg Key Aspupload How Do I Figure Out What My OS Reg Key Is?

How do I figure out what my OS reg key is? - reg key aspupload

I use the term "Bart PE" and have a big blue screen with "Go" in the corner is. I click on Go - Programs - Run XP recovery CD "with my installation CD (not original - I copied my picture, of course) and asks me to enter my key. How do I know this is it?