Usable memory (RAM) less than installed Memory; Fixed || Windows 7, 8 and 10!

If this do not solve your problem, may be that you have 32-bit OS. The 32-bit operating system is only able to use max. 3 or 4GB RAM. Not MORE THAN THIS! If you have more installed memory, you should upgrade your operating system to 64-bit operating system. Which is able to use up to 16 GB.
Hope this will fix your problem!
If this do not fix, please tell me in the comments.

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