[randomaccess]

Sorry but the second post is incorrect, 32bit operating systems can only effectively use 3gb or ram while 64bit operating systems are more effective with 4gb of ram (random access memory) or more. Hence why you only see 3gb of ram, i presume then that your using 32bit xp or vista? If so then if you upgraded to 64bit then your full 4gb of ram would be utilized.