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... Change desktop background when Windows 10 is not activated?

Change the Windows 10 desktop wallpaper even without activation, its really really easy Once Windows 10 is installed but Windows 10 is not activated ,

... Auto size Virtual Memory in Windows 10?

Virtual Memory in Windows 10, is the the pagefile.sys file you can customize and change the size or location of Win 10 Virtual Memory anytime

... The accurate determination of the CPU frequency, exactly

The accurate determination of the CPU frequency and that exactly does not require any IT support courses under Windows 10 However, you can use this example

... Right Q-Dir Version