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4. Uninstall everything you don't use
No, really, everything; browser toolbars, programs you forgot about, games you didn't finish. See that system tray in the bottom right stuffed to the gills? Thin it down.
Be sensible — leave things like Windows updates and hardware drivers. If you're not sure what something is, grab a friendly geek or leave it alone.
While you could use Windows's in-built uninstaller, something like IObit Installer will allow you to automate the process somewhat by queuing a whole lot of uninstalls at once.
Image credit: Craig Simms/CBSi