If you're tired of keeping constant tabs on the market and just want to buy shares of some quality companies and tuck them away for a while, great! You know the company. Microsoft's Windows operating system is installed on 75% of the world's desktops and laptops, according to data from GlobalStats, and that market share appears to be stabilizing after falling back from more than 90% a decade ago when smartphones and Macs became a more mainstream way of interfacing with the web.