Just download the zip file from the website i provided... when the download is done right click the file and choose extract all then extract then open the cupz.exe file(its the one that looks like a memory chip) then accept the windows alert that the UAC(Vista user account control) then in a couple seconds the program will start, then click the SPD tab... walla... then you will know what size memory is currently in the machine... ;)
If anyone wants to use CPU-z and Vista 64bit you need to start the computer and press F8 immediately as if you are going to run in "safe mode" and choose the option toward the bottom, "don't use digitally signed drivers", or something similar to that... then press enter... the machine will work normally and
will even remember this setting even after waking up from a "sleep state" if you do a "shut down" you will have to re-do the F8 if you want this option again.