Alright, so. I have 4GB of DDR2 ram installed on my computer, when I installed windows 7 and then go to system it says; RAM Installed 4GB (2.94GB Useable) Now, my question is. Why? Has anyone else had this problem. Here some more information. 1. Windows 7, 7100 RC. 2. Windows 7 IS 64BIT. 3. I have dualboot setup. Windows XP SP3, Windows 7 7100 64BIT. Each is on there own harddrive. 4. All the RAM is the same. Any help would be awesome. Thanks in advanced.