x86 upgraded to x64?

I have a Vista x64 installation cd from hp.com.
Can i use this cd on my laptop which is currently x86, because i really need to wipe away everything on this laptop, and just reformat it.
Just curious.

-Superkid

Welcome
If you have an HP laptop which came with Vista preinstalled and you, now have a Vista DVD, 64 bit, from HP, you can use it if:
Your computer can handle 64 bit
You use the 64 bit on only one computer and you do not use the x64 on any other computer.
Finally, it may be better to use the factory restoration partition. We can help if you give us the make and model of your computer.