Hey, OneWorld22, don't panic out there!.. Here are some reasons why:
(a) Remember that not all the world runs on Windows! In fact, many firms deliberately avoid Microsoft because of the large number of security breaches.
(b) Even if the source code were viewed by hackers, all they would have access to would be systems protected by Microsoft. Yes, potentially bad news - but nobody protects their business critical systems with only Microsoft windows security.
So keep an eye on Windows updates, but don't panic!