Windows 10: Lost windows key due to harddrive failure

After having a hard drive failure recently and installing windows 10 on a new drive I can't gain access to my Old windows 10 key and don't know what to do about it. I've tried talking to support but they have not been helpful. I originally had windows 8 on this machine years ago and then upgraded to windows 10 during the free upgrade phase. I can't find any source for the product key within my device and it won't activate despite using the same microsoft account and same motherboard.

:)

 

Best gaming harddrive Sugestion ???

Seagate states on their 750gb,32mb cache harddrive that the best application is video surveillance.(liquor stores,how very sad and completly overpriced for the amount of problems they have).Yet Passmark lists this near the top of their harddrive page.Any one have a suggestion for something that will last.(maybe samsung???)
Also I was considering a Raidmax hybrid 2 sli 630w powersupply.Any thoughts on Raidmax??

 

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.

 

lost windows activation key, need new free os thats just as easy as windows

Basiclly i came to reinstall windows, formatted my harddrive then when it came to activate i lost my oem key thing, it wasnt a sticker on my case but printed out and ive lost it. I no, noway of getting it back so i need an alternative os thats easy to use. Linux was way too hard for me. Things like updating flash player etc with windows you just doubble click the icon then next till its done, linux on the other hand was allot harder. So guys any advice?