When Microsoft discovered a critical security flaw in Macromedia Flash Player, Adobe fixed it the very moment and issued an update.

That's good teamwork. Adobe's advisory even credits Microsoft with discovering the vulnerabilities.

The most recent version of Adobe Flash Player is 8.0.24.0 . Flash player is redistributed with all Windows systems.

Install Adobe Flash Player | Download Flash Player for Firefox

Microsoft - Microsoft Security Advisory (916208)

Adobe - APSB06-03 Flash Player Update to Address Security Vulnerabilities