I am having a problem with my VM not registering extra RAM on Server 2008 R2. After a recent update and reboot, I noticed that my RAM is incorrect. I have 16G of RAM on my machine, but it only reads 12G. I understand that the PAE needs to be enabled in order for it to show on a 32 bit OS, but I have a 64 bit OS. There is 3 virtual servers allocating 4G max on each, which is 12G, but where is the other 4G? It was registering prior to the update! Help!