Let's face it, Microsoft (MSFT 1.58%) has no shortage of headaches ahead of it. The company that dominated the PC era like no other (except perhaps Intel), is now facing a slow slide to irrelevance as consumers and professionals increasingly substitute their laptops and PCs for smartphones and tablets. However, the company has two aces up its sleeve in its Office and Windows segments, both of which remain cash cows even as the PC market tanks. Fortunately, this buys Microsoft more time than most companies could hope for, which it can use to revamp its products and strategy. In this video, Fool contributor Andrew Tonner tells investors the two most critical moves Microsoft and its new CEO will need to make.