For What reasons you format your pc?

i reformated (and reinstalled win 7) on one of my laptops after 4 years to start from scratch. This is a quite old machine that
i'm also sometimes using for software tests, for testing registry keys and software settings etc. So i decided to reinstal everything (system/software): i wanted to have an absolutely 'clean' system again on this laptop... .
I'm also running two another laptops: both installations (windows and software) are 2-3 years old. I dont think its necessary to frequently reinstal the entire system. I guess it was really/absolutely necessary in the 90's (windows 95/98, Windows XP)....
...but now... ....i guess it isn't really necessary when running the latest OS's (like Win7, Win8.1, Win10)....
 
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I'm formating my HDD only if there's need for that, like if I have problem that can't be fixed easy way or my PC has poor performance. That's usually every 2 or 3 years, depends in what condition is the OS.

Last time I done clean installation of Windows was few months ago. I had some problems with Windows activation after upgrade so I did clean install. Before doing clean install of Windows, I always search for solution for my problem and when there isn't solution (or solution is not working for me), the only thing I could do is to reinstall Windows.
 
I Format every year, when I feel my Windows this loaded with installations/uninstall starts getting a little slow. Lately I have formatted every new upgrade from Win 10 because they corrupt some programs.
 
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I format my computer when there are significant performance issues. I do it on average every 2 years.:)
 
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I format when uninstall security software or when i see corruptions in sfc or dism i think if windows not are 100% ok the other programs are bad, i think if windows fail in dism or sfc "antiviruses does not run well" and security apps are sometimes imposible to install they let traces and traces and traces u u. Some times i format 7 times a year and now whith windows 10 everytime when tey relese a new bulid