Windows 7 and Google Chrome browser an "excellent" combination on netbooks. "The two together make pretty good use of a netbook’s most limited resources: screen size and processor power." "Adding Chrome to Windows 7 complete the picture for netbook user. That’s because Chrome’s lightweight and fast, rendering pages (especially JavaScript-heavy ones, like Gmail, Google Docs) especially quickly. And because of compact address bar, tabs and toolbar — especially if you’re using “Minimalist” theme — more of screen is available to display with a tiny 9- or 10-inch LCD. Windows 7 may not be as speedy as a stripped-down Linux distro, but it runs well enough, support every component on MSI Wind without trouble. By deep-sixing Internet Explorer and replacing it with Chrome, it becomes best netbook option," writes Dylan Twene.

Note: I’ve using Window 7 Ultimate, Norton Internet Security 2010, and Microsoft Security Essentials, right from the private beta and on Lenovo Ideapad S10. And the performance is awesome.