Downgrade Vista from 64 bit to 32 bit.

Hey.
I recently bought a HP compaq 6715b running Vista business. When I went to install it recommended 64 bit, and after finishing i made the back up discs. However, It seems that Zonealarm, among other programs, does not work, and since I will not be using the notebook to be running programs requiring >4gb of RAM I wish to downgrade my system to 64bit.
I tried reinstalling with the discs hoping to get to the selection screen again, but no luck.

How can I downgrade?

Thanks in advance guys

>>1

Didn't know HP offered the option of 64 vs 32 bit on their machines... if it's anything like the bilingual laptops they're selling in Canada ATM, you'll likely have to obtain fresh install media.

Or, of course, use your Windows Vista Business license to legally run XP Pro (yes, this is /actually/ legit.