It was likely running just fine with a 32 bit OS. How much memory does it have installed? Better yet, what are the core system specs?
You don't really need a list of instructions. You back up your data, and boot from the Windows 7 disc. I would download drivers for either of your network connections, and see what Windows 7 finds on it's own once installed and once Windows Update runs. You can go back to HP's website for anything it doesn't find. All of those apps should be listed on HP's website, but if not, backup your C:\swsetup directory, too. On all HP's I've dealt with, that folder contains the installers your programs that were preinstalled.