Does anybody know the difference between Windows XP Pro 64 bit - work at home and Windows XP Pro 64 bit OEM? The price difference between the two is about $50.00. http://www.von1.com/shopping/descriptions.php?auth=ArdqI8v4k4qFXtC4d314Xkh1dPToF5/4D9cb/+9iixs= http://www.newegg.com/Product/Product.aspx?Item=N82E16832116378 Is Von1 one of those places I shouldn't buy from? I'm thinking about buying two video cards that have 1GB memory each which would place my total memory at 4GB. To avoid any memory issues I was thinking about installing Windows XP Pro 64 bit.