There are various 3rd party tools for Windows that lets you clean up your system memory but they take their time. Sometimes a user needs to free up his memory quickly before the computer freezes or hangs up.
MaxMem is a free tool for Windows that lets you clean up the system memory both quickly and efficiently. It silently sits and monitors the memory from the System tray. To clean up the memory, right-click the MaxMem icon in the system tray, select Free, and now further select from the list of 3 options: Normal, Periodic, and Aggressive.
These 3 option free up the system memory depending on the boundaries. They do not close any applications, but try to find useless and non-responsive background processes and then close them.
You can select the memory boundaries for each of these options by going to Preferences. Right-click the icon in the system tray and select Configuration from the context menu.
You can also quickly free up memory space by left clicking the icon, you can select the type of operation from the preferences window. It works smoothly on all versions of Windows, both 32-bit and 64-bit. Enjoy!