Unlock better CPU and more RAM?

Hello all,

I have an older HP a6057c tower that I am getting ready to run FreeNAS on, but first need to get where I need it to be. It has an Intel C2D E4300, 1.8Ghz 2MB Cache, and 1GB RAM. I have installed 8GB RAM, and an Intel C2D E8600, 3.3Ghz 6MB Cache. It has an ASUS P5LP-LE Motherboard.

Here is my issue, The machine is 64 bit capable, and I did install 64bit windows to verify, the CPU is also 64bit capable. But for some reason, the machine is only seeing 3.5GB RAM, both in windows and FreeNAS. Am wondering if the full 8GB can be unlocked in my BIOS

Also, the machine does noot boot or even post with the E8600 installed. I have some screen shots, and I have the BIOS that is installed. The BIOS is an HP install EXE, Will that work?

http://scontent-a-iad.xx.fbcdn.net/hphot...8449_o.jpg

http://scontent-a-iad.xx.fbcdn.net/hphot...7506_o.jpg

http://fbcdn-sphotos-g-a.akamaihd.net/hp...5545_o.jpg

Also, This is the link to the BIOS:
http://h10025.www1.hp.com/ewfrf/wc/softw...6&sw_lang=