Can you just confirm model and version number? this will show you how. version.
Is this your motherboard? Mobo.
If so here is a list of CPU's supported. Supported CPU's.
If you download and install this,SIW, the Home edition is all you need. When you run it you will see on the left hand side about half way down the heading Hardware clicking on anything under that will tell you what you have in your PC. It would be useful to know what RAM you have amount and type as this is a reasonable cheap area for upgrading, though I suspect you have DDR2 RAM which is more expensive than the more modern DDR3.