What are some alternatives?
When comparing Everything and Alfred, you can also consider the following products
DocFetcher - DocFetcher is a portable German/English open source desktop search application.
Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
Agent Ransack - Agent Ransack is a tool for finding files and information on your hard drive fast and efficiently.
Listary - Listary is a revolutionary search utility for Windows
RecentX - RecentX is an innovative launcher that gives you instant access to your files, folders, programs...
Synapse - Synapse is a semantic launcher written in Vala that you can use to start applications as well as find and access relevant documents and files by making use of the Zeitgeist engine.