Seeing new Ads from Apple make me laugh.
If you're looking back to the past, since Windows XP launched, many security problems occured: Virus, Spyware and many Malware.
Are you thinking about formating?
No, I never do answer problems like that. All of problems must have its root, formating is just point to end of result. Never near the point of solutions.
If you have data, you want to format it all? To begin from zero?
If you wanna keep it, how you can make sure that all data is not fraud? And may be it now the carrier.
To learn what cause of problems and take all at root may be the best solutions for all.
That what I believe and still.