Windows 10: Lost windows licence key

I had windows licence key in my MacBook Air 2017 but I had just factory reset it and now I am unable to retrieve my lost windows licence key .is there anyone way I can get it back without needing to buy a complete new one?

:)

 

Reinstalling Windows 10 without a licence key

Hi,

I have a 10 year old laptop which originally was running Windows Vista. Due to the manufacturer date of the laptop, I was entitled to the free upgrade to Windows 7, which I kept until the roll-out of the Windows 10 upgrade. When my laptop upgraded to Windows
10, I did not pay for the upgrade and did not receive a licence key.

1. If I go to the Windows 10 download tool and select install with the 'keep Nothing during the upgrade' option, will I require a licence key?
   
2. Can I build the laptop from scratch if it was originally a Visa machine or will I need to step from Vista to 8.1 to 10?

Regards

Keith

 

Lost xp key.

i lost my XP key. And i need it.
Is there a way to find the XP key i am using now in Windows?

Thanks.

 

Parallels Workstation 6 Licence Key

Hello
Does anybody have a parallels workstation 6 licence key? I am trying to run a VM I created a long time ago and I lost my licence key. I need a licence key for version 6, as that is the version I personally used. Anyone have a licence key? I would buy a new one but parallels removed the purchase page for parallels workstation and now the product parallels desktop does not support windows. Thank you.