Thanks Jock1e, but you are obviously better clued up than me. Presumably I save this externally, else there is little point in doing it. What will this 'recovery' action save? Will it save Windows and all my apps? Will I be able to specify destination drive/medium, and what sort of memory storage do I need - is a memory stick OK? I know this is like asking how long is a piece of string, but what size memory stick do I need to get - I have Windows 8 Microsoft Office, Photoshop, but little else.
How to get Windows 10 now: how to download and install Windows 10 even if GWX.exe is missing