Pc not responding every time

Jan 17, 2019
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I have purchased a assemble CPU online and create new pc after few day my pc freezing randomly I checked driver update but not solve my problem and I reinstall windows 10 four times but not solve problems permanently after reinstall windows smoth work few days then start freezing.
My system specs
Winnfox h55 LGA 1156
i5 1st gen 660,monitor-powereye LM3610,hp mouse and keyboard
Luminous UPS Ram 4gb 2x
I also check ram to different pc,its ok.where is problem?