Windows

Task View is accessed from the 'squares' icon by the Windows button and displays all open windows reduced size.  The keyboard short cut to Task View is Windows + Tab, click on a reduced window to select it or Windows + Tab again to toggle back to normal view.

You start up your pc/laptop (or perhaps it restarts itself) and you get something like Operating System not found, perhaps you've left a memory stick in a USB port and the pc is trying to boot from that?  Just remove it and maybe change the device order in which the pc's BIOS looks for the operating system, quite how you do this will depend on your particular pc, Google it.

Windows 10's picture viewer Photo Gallery defaults to slide shows in that annoying Pan and zoom Ken Burns way.  If you hover your mouse top left a Change theme pull down appears so you can change to slightly less irritating transitions but there doesn't seem to be a way to change the default, that's stuck at Pan and zoom.

In Windows 10 lots of the old favourites like Control Panel aren't immediately apparent, point the mouse at the Windows button bottom left (unless you've moved the task bar) and click the right mouse button (if you're right handed) to get this useful menu.

The thing about Windows is it's made mostly by Americans and they don't realise that in their foreign people do strange things like sometimes turn their computer off.  The Windows anniversary update has made it even more difficult to turn the bloody thing off.  You can still do it from the keyboard but you need to know the shortcut Windows key + X/U/U.  We've also added on a desktop the shortcut described at CNet (Option 2: halfway down).

The Windows 10 Anniversary Update took forever here, forced multiple reboots with the last reboot leaving a desktop hanging and we had to force our own reboot.  If like us you've previously turned Cortana off annoyingly the update turns it back on and removes the on/off toggle.  How-To Geek have a download (halfway down the page) that's a one click fix.

Worth repeating: turn on Toggle Keys and you'll hear a confirming higher pitched tone when you turn on Caps; Num or Scroll Lock, turn them off and you'll hear a lower pitched tone.  To set Toggel Keys in Windows 10 go Windows key/Settings/Ease of Access/Keyboard/Toggle Keys-On.

Windows 10 brings the gestures you know on other devices to your touchpad.  Particularly useful if your touchpad doesn't have scroll bars is the two fingered swipe.

A useful new keyboard shortcut in Windows 10 is Windows key + X which pops up a substantial menu of system stuff and has underlined keyboard shortcuts.  You can do the same thing by right clicking what's now the Windows 10 logo bottom left and was the Start button, the same menu appears and though keyboard shortcuts are not underlined they still function.

Updating a struggling Vista laptop we should have followed our own advice and when some updates failed instead of trying to force it first do a reboot, which on this occasion sorted it out.

When we upgraded to Windows 10 in that American way it added a US keyboard causing ENG to appear bottom right on the task bar.  (ENG lets you switch between keyboards.)  No biggy but a bit annoying and another bit of the screen occupied for no reward.  Removing the US keyboard is a little bit of a faff, we went Windows/C/Control Panel/Language, selected English (United States) and then clicked Remove above ... ENG gone.

Americans eh?  In Windows 10 it still takes three clicks to turn your pc off because our colonial cousins never do, it first assumes you have a US keyboard and there's no DVD player software because we're all going to have Netflix subscriptions ... except when we put Ghost World in and after a bit of clicking it did play in the Microscoft DVD player.  Microscoft have really muddied the water over this but we upgraded to 10 from Win 7 and presumably got a free DVD player download.  If this doesn't work for you try the free, open source and French VLC media player.