You have a foxconn board and you also have their latest bios. The good news is that you can run any 5xxx core2 duo cpus such as the e5400, and also the 8xxx wolfdales such as the e8500. Your board won't run a quad core; it has a wattage limit of about 95. Check ebay for one of those dual core cpus; a 5400 might go for $50-60; the e8500 for $90-100. For motherboards, you might look at a g41 for ddr2 or upgrade to ddr3. 775 boards come in a wide variety of chipsets; the p43 is common now; some of the older p45, x38, and x48 are harder to find. You probably need to use only micro-atx unless you have a full size case, which takes atx or micro atx boards.
Ah ok, because at the moment i have a intel pentium dual CPU E2180 Model : 45CMX VP SERIES M3.. But i will look for ddr3 My friend said get am3 motherboard with a phenom II x4 and 4 gb of 133 ddr3 ram but didn't know if they would fit :P
Most micro atx boards should fit your oem case. They are pretty much standarized. You may not get 4 ram slots; If you go with amd and ddr3, get an am3+ certified board for the newer cpus. They don't cost that much more. And 2x4 gb ddr3 is only about $60 for some 1333 in the usa. So 2 ram slots is all you really need.