Downloads: The five best apps for speeding up your PC

If your PC is slowing down, it might be time for a new machine; or you might just need to clear out the clutter. Tuning up your system, clearing out software you don't use and making sure you're not running programs you don't need in the background can make a big difference to performance.What's more, cleaning up your system like this is better than running tweaking tools that promise improvements but can end up disabling system features you need for Windows to work properly.1. AutorunsThe Windo