I am running Windows 7 Ultimate 32 bit with 4 GB RAM... My Intel Core Duo 1.73 GHz doesn't support 64 bit. I have been looking into a Intel Core 2 Duo, but don't know if my computer's motherboard is compatible. I have a Toshiba P105-s6177.
http://ark.intel.com/Compare.aspx?ids=27232,33099,
Here are the stats of my CPU vs the one I am looking at. Are they compatible?