Vista locking out users?

Apparently Vista will require users reactivate their copy of the OS even when it has already been properly activated. Simply installing patches to some application software can cause Vista to request you reactivate. Microsoft has said that the problem is a bug in the OS, but one has to wonder how many bugs it takes before people realize that Microsoft's concerns over piracy is getting in the way of good software design.

How many millions of dollars and thousands of man hours has Microsoft thrown at the piracy solution, only to annoy tens of millions of legitimate users?