By default Windows calculator doesn't support order of operation, to enable the functionality you need to activate the scientific view, let me show you how.
If the DVDs, USB sticks, phones, cameras or any other media and devices are automatically starting to play or open explorer windows and your don't want them to, this is how you tweak the AutoPlay settings.
If there is no WiFi hotspot available and you still want to surf the web with your mobile device, you need to have your mobile provider's APN settings entered and this is where you find them.
If you want to make a clean install of the new OS X Mavericks or even the older versions of Mac OS X, than I strongly suggest you to create a bootable OS X key or a drive.
