I am currently running vista with parallels 5.0 on my macbook pro with 4gb of ram...i want to download the windows 7 upgrade from microsoft but i am not sure if there is anything special i need to do?..if i download 7 will it simply load over vista without incident and equally as important will there be any complications using parallels 5.0...will i have to change any setings or do anything different or will it just open as windows 7 when i start up parallels after the download?...any help would be very much appreciated!