MSI G41M-P33 Combo LGA 771 Microcode

Hello..i'm totally new to this.
All i know is i tried modifying my lga 775 socket to support lga 771 xeon cpu's
I can boot my pc..but instead of running faster, it's actually really slow.

I have an MSI G41M-P33 Combo ( MS-7592 )
Link : http://www.msi.com/product/mb/G41M-P33-Combo.html
My bios version is American Megatrends Inc. V32.12 13/09/2013
The Xeon processor i'm trying to run is a xeon E5450 3.00 GHz
Before that i had a pentium 4 640 prescott

I've read at http://www.delidded.com/lga-771-to-775-a...patibility that i'll be needing the microcode (idk what that is)

Can somebody help me?!
Thanks in advance.