Hello and welcome to PC Help Forum.
If you could go to your user cp and list your hard ware of your computer and check show others this would help greatly.
You would proberly need 184 pin or another type.
Use this scanner and post results back here on thread:
Memory upgrades, flash media, and usb storage at Crucial.com
The scanner will give you details of
RAM that is compatable and how much max
RAM you computer can actualy have installed.
If we have your listed make and model of motherboard this would also help your issue.