Does my friend need to reinstall windows?

Nov 22, 2018
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Hello! Happy thanksgiving! So my long time friend who never had a big budget built a pc a few years back. He had a really cheap rig, a amd sempron 145 and a gt 610. So i mailed him my old fx8350 and mobo for it and ram. He put it in but is still lagging in most games. Does he need to install windows again? Thanks