Help urgent

Marchfc7 said:

but the person says they are going to revoke the windows licence can they do this and what does it mean ?

Nope, they can not do anything to revoke your licence, whenever it came from.
Once 10 is activated, it stays that way forever, even after reinstall on that same computer.
You will be probably using illegally, but unless it is a corporate computer, it does not really matter.

MSDN keys are genuine keys. But the terms of the agreement you accept to get them means you can't resell them. They are for your personal use only, and even then, its for testing purposes. I have an MSDN subscription. I can't revoke any of my keys, but Microsoft can. I'd be surprised if very many people were selling MSDN keys. MSDN is very expensive and Microsoft holds a dim view to anyone reselling those keys. You get caught and by by subscription. They have also limited the number of keys you can request. I get 5 for 10 Pro and 5 for 10 Home. You'd have to sell a lot of keys to get your investment back. There were a lot of TechNet keys sold online though, likely why TechNet was killed. It was a lot cheaper than an MSDN subscription, a lot cheaper. Some bought it just to sell the keys. They also limited the number of keys you could get with TechNet towards the end. It was 3 keys per edition and not every edition when I had my TechNet subscription.

There are other ways this can happen. If you bought a used Company PC that has a MAK key on it. The company that has the license for that key can revoke it. I do believe they can also lock out individual PC's from activating with that key. I'm guessing the OP has a Volume License key, not a full Retail key. They seem to be MIA now though so we may never know.

NavyLCDR said:

Can't upgrade from Vista to Windows 10.

True Vista is not included in the free upgrade deal. You can buy a discounted 7 or 8 and then upgrade to 10. :)