Some time ago I acquired a laptop previously used by my mother. I've never used it, but now that I'm doing more work on line (courtesy of a certain pandemic) I thought the laptop might be useful rather than being tied to my desktop pc. The laptop wasn't working well, so I reinstalled Windows (Vista) from the original CD and then upgraded to Windows 7. I then tried to use the Windows 10 upgrade tool (having read that this still works if you have an older version of Windows) but it wouldn't recognise the Windows 7 activation code. I've since realised that the Windows 7 installation disk that I used was probably the one from my desktop, so Microsoft won't let me use it on another PC, which is fair enough. My mother (who lives in another part of the country) managed to send me the product key from her old Windows 7 disk, but that didn't work either, presumably because it doesn't match the version installed. The old laptop will probably only be used for a few months and I don't have the money at present to buy a new laptop nor do I really want to spend alot of money on buying Windows 10 or spend less money on a dodgy product key . Is there any way around this? Would it work if I could get my mother's Windows 7 installation disk, or would it be worth talking to Microsoft? (As I understand it, I wouldn't be able to upgrade direct from her old Vista OS). Any suggestions or am I on a hide into nowhere? Thanks.