the microsoft guys must have thought abt all the issues when developing the new OS.
It is very difficult to provide security to the popular softwares because the no of people trying to break or attack it have increased fourfold. People generally tend to attack the latest system.
If whole world was using windows 98 I think it may have disintegrated.
I would like to quote from darwins theory change is inevitable.We have to constantly adapt to it to survive