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Numerous software is created for the purpose to let users Clean up their Computer's RAM, but I found that this software is developed with very simple lines of codes, it doesn't take any effort for a developer to create these kinds of programs.
So if you want to Clean and Erase your Computer's Memory , then you can by following the following steps.
Clean your RAM with Notepad
1) Open Notepad (Start > Run > Notepad)
2) Type FreeMem=Space(10240000000)
3) You can change the value 1024 with any other value according to your RAM size (e.g: 512 if you have 512Mb of Memory)
4) Save it as "L2C.VBS"
5) If you want to clean your RAM then Run the file you created in step 4.
Done!