If your windows is running smoothly and not giving you grief, you shouldn’t need to reinstall it regularly.

There’s a few exceptions however:

• You should reinstall Windows when upgrading to a new version of Windows.

Skip the upgrade install and go straight for a clean install, which will work better. Performing an upgrade install can result in a variety of issues—it’s better to start with a clean slate.

• If your OS has slowed down and isn’t speeding up no matter how many programs you remove

Reinstalling Windows may often be a faster way to get rid of malware and fix other system issues than actually troubleshooting and repairing the specific problem.