The aptly named Everything is a lightning-fast, no-frills replacement for Windows' native file search. Open the program, start typing, and any files or folders that match your search appear as soon as you start typing, like an offline version of Google's instant-search results.
Once you've used this, it's hard to go back to Microsoft's search solution—though it'd be nice if Everything scoured the content of files in addition to file names.
Pro tip: Slap Everything in your taskbar for even faster one-click access to the program. With this tool, you'll forget the Start button even existed.