Microsoft is set to release two security updates today as an installment of its monthly "Patch Tuesday" release cycle.

The bulletins, affecting the Microsoft Windows operating system, have a maximum severity rating of "critical" and will require a restart, the Redmond, Wash.,-based computing giant said on its website.

The company will also release an updated version of its malicious software-removal tool through Windows Update, Microsoft Update, the Windows Server Update Services and the Download Center.

A Microsoft spokesperson said on Monday that the company had no new information about the updates to release.

Last month, Microsoft released a single patch, containing three separate updates, that addressed problems with either Windows Media Format or Enhanced Media Format. Before the November release, Microsoft also said that update would have a critical rating.