I have an early '07 Macbook that I bought from my friend. He took relatively good care of it and sold it to me for a few bucks. The hard drive crashed and he just bought a new MBP (he is a film major in college and needed one anyway). So, my question is I will be upgrading the ram from 1gb to 2gb and will be installing Snow Leopard. How much life do I have left in this computer and will upgrading the ram and operating system help to extend its life for a couple more years?