The new-car smell
After a few trips around the block, Windows starts to feel a bit...worn. Installed programs add up, things slow down, and your computer simply doesn't respond as well as it did fresh out of the box. In ye olden days, that was your cue to back up your data, wipe your hard drive, and completely reinstall the OS. Windows 8's awesome new Refresh option takes the hassle out of the process, keeping your files, settings, and modern UI apps while otherwise reinstalling the entire operating system--and it does so in fairly brisk fashion.