A great thing to have onhand is Ubuntu Desktop OS on a USB stick. Especially since USB sticks are priced at an all time low. For example, on a corporate laptop equipped with full-disk encryption, offline network policy enforcement, user access inside Windows, and a highly customized desktop experience removing ability to right-click, view options, or see the Control Panel. Fortunately, promptly hitting F10 at boot time allows access into boot options, select USB, test Ubuntu, enable Multi-verse libraries, enable VLC Player and watch movies. Bypassing all the corporate security and allowing us to actually use the laptop hardware. You can also use it to recover files from a damaged Windows machine.