After doing all I know to do to check whether my old dual core computer is capable of win7 64bit Pro, I went in to buy the OS and a new hard drive. I didn't want to upgrade the older machine's C drive. Walked out with a new computer for $75 more! It's just an i3 with a 500Gb drive but it runs slick as greased lightning. I now have to install my business apps which only take too long. I like that it already is easily seen and access to my other vista and win 7 computers. I can't get over how cheap these computers are. It's an i7-2120 with 8Gb ram and an Asus MB. can you believe it?- $449