note that it is easy to install XP 64bit as a dual boot on your current pc which you have running XP 32bit. so if the 64bit stuff doesnt work out for you, you havn't lost your current setup. you will need to partition your hard drive though in order to have a second xp install (you can download 'minitool partition wizard' which is free to do that). an alternative method would be to install 64bit xp on a different hard drive from your main one.