No longer do you have to download a third-party application and create a bootable disk to check for memory problems. Windows 7 comes with an inbuilt tool that just needs a reboot to work It's called Windows Memory Diagnostic and can be found under the Administrative tools section in the Control Panel.

Run it and it will prompt you. You can reboot immediately or the scan can be set run on the next reboot The scan takes a while. Press [Esc] at any moment to stop the scan and continue booting into Windows. If there are any errors, you know there are issues with your memory. This is a great tool run if your Windows has been facing random crashes and blue screens.