If you install W7, you do want to update to SP1, but not much beyond that. Find an archive with SP1 - and then switch of Windows Update completely. All what is bad in W10l has been inverse-patched into W8 and W7 as well. So do not move beyond a patch status much later than SP1.
You would want to go to dual boot then, a Linux installation for surfing, emailing, browsing, work, for everything except
- game-launching, which is the only purpose you should use a not-upated and thus unsecure W7 for.
I did that myself and still do so, though not dual boot on one system anymore (that was for some testing months only), but now separating the two on two rigs. It works.
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If you feel nuts, consult an expert.
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