How often do you reformat your PC?

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Current Events » How often do you reformat your PC?
I feel like despite Windows dumbing down the OS and making it idiot proof, it still slows down after like a year or so, and you need to just pull the plug and do a complete reset.
https://i.imgur.com/XNEdLrJ.png
I haven't had a PC in like 12 years so never.
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Never done that.
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Only when upgrading to a newer version of Windows (clean install) or when I have another good reason to like Windows being FUBAR.

For instance, Im contemplating doing it soon because I havent been able to get the AMD chipset drivers to update in 2 years and its pissing me off.

https://store.steampowered.com/wishlist/profiles/76561198052113750
Only when I upgrade the OS version. So not too often.
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Current Events » How often do you reformat your PC?