On one level, this isn’t a half-bad idea. Unfortunately, few computer users in their right minds will allow the Microsoft monopoly to do whatever it wants to their computers.
If Microsoft wants to protect its users, and its reputation, it needs to do a proper job of developing and testing its software. This is not an easy thing to do, make no mistake. You can bet, however, if there was any real competition out there, MS would be doing a better job at it.