really? can use back the old key? which means i can transfer my key to another pc right?

This post has been edited by mdzaboy: Jul 31 2015, 09:03 PM

What I mean is that changing PC hardwares. I thought you need to call microsoft for verification if you change your current pc setup too much, maybe the Win10 license that I own only registers previous hardware setup, but not the brand new PC setup.

Change motherboard = You WILL need to contact
Change Ram/Card = Don't really need to do that

Ok one more question, when I upgrade to Win10, will microsoft give me a brand new cd key for Win10? Or I just use back the original Win8.1 cdkey in case it needed when installation?

There is no cd key anymore. Microsoft check activation by hardware id now.

What is your issue with Kasperky? Mine is ok. I even forgot to turn it off during upgrade but everything went ok

It just disappear somehow. There is no startup or anything on my desktop.
Well it's fine anyway 2016 is out and I'm using that now.

Funny though because when I upgrade my Surface to 10, even Kaspersky works.
But it gives me some warning of having some limitation and stuff.

Hardware ID? Does it mean that I can't use the Win10 license on a brand new PC, since hardware ID will not be the same?

Kind of like that.You can read more on this post:
https://www.reddit.com/r/Windows10/comments..._windows_os_to/

It doesn't say anything about reusability of Win10 license on other PC, but since this upgrade is free it makes sense that limited use of Win10 license, maybe if I buy the retail copy it'll be different story.

I have alot of Animes & Movies in my C drive.

Is it possible to install Windows 10 without deleting it?

It's quite a hassle if I wanted to transfer all of it to portable HD.

Yes,do upgrade,but if you use this way the old windows will eat your C drive first before you clean it

tie with your motherboard ID. so if you change your mobo, juz call up to MS center, provide them the product key and some info and they will provide you the code to activate your window again.
MS call center is very helpful and efficient to solve your problem

Upgrade option. It will keep all your files and setting. Even if you perform clean install you can still be able to find it in windows.old folder

Just the same with current call for new windows activation, thanks.

about no. 2, one year means the period for free upgrade offer. after that you pay for it. you can use w10 forever.

no you cannot do such transfer. the old key will be consumed. this means the old license will merge with new w10. if the old key is retail, then its retail license terms will merge with w10 terms.

you can use w10 key on another machine provided it's a retail key. call ms support when you do that for reactivation.

although you can do that, i suggest you back them up first to avoid issues like data loss during the upgrade process.

thats for OEM right? for retail what i know u can activate on other pc.

mine is retail version

Hi, how to delete that windows.old folder as it took up some space on my c drive? I tried to delete it and it says that I don't have permission to do it.....

How can I get my w10 key then? Do you mean w8.1 key=win10 key?

i mean you cannot use the old key for the old os on another computer. after upgrade, that key is tied to w10.

you can transfer w10 to another computer.