Cannot see more than 4GB of RAM in task manager

Problem: You have a system with Windows Vista, Windows 7 or Windows 2008 with more than 4 GB of RAM. You can see in the System Properties that there is more than 4GB but when you see the Memory value in task manager you see only 4 GB of RAM

Solution: open an elevated command line window (run as administrator) and type the command

BCDEdit /set PAE forceenable.

Reboot the machine