For an average user (doing on-line payments, etc.), would it be useful to periodically conduct a OS re-installation of his computer to improve security? How often would that be and how much extra security would that be?
Obviously, if you have the almost same system as before (thus almost the same flaws), then you are as likely to be infected the same way you were before OS re-installation. But you could hope to be clean for a moment. Is this improvement relevant? I guess this question is hard since it would be hard (impossible) to assess an average time a system is compromised. Are there any best practices concerning periodic fresh OS installations ?
Would periodic OS re-installation be useful in a company environment?