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Is there any negative effect if I install Windows 10 in a very low processor laptop?
There is no negative impact as such on anything. Windows 10 requires minimum 1 gigahertz (GHz) or faster processor or System on a Chip (SoC), so you install on any processor above which meets the requirement. However on lesser speed processors the speed performance you get will also be very low. As windows 10 is rich in its graphics display and the processing is pretty fast behind it. So it is not suitable to use on machines with lesser speed processors.