Do yourselves a favor; just use Windows 10 without registering it, or buy a cheap CD key on the internet.

When it finished installing, it said I had an invalid CD key and my entire system was paralyzed

I contacted Microsoft asking them what the error was for and they said that the key was error

Overall, if you don't want to risk a headache from buying cheap keys from sketchy sites that might not work, then go ahead and buy this

so it doesn't work , wrong key, thought it worked, activate windows keeps coming up

Worked fine just not the product key.

Like many of the commenters below, the software didn't accept the key, and I began to feel like I got a bad product.

The product key on the envelope did not work.

I used a coin and actually scratched away the key itself

Maybe MS thinks everyone will know to treat the CD cover slip like a scratch-off lottery ticket in order to find the product key, but I find the total lack of instructions for finding the key in the purchased package and the incorrect information posted on the MS website to be unacceptable.

ITS A SCAM!!!!!!!!I was sold a fake Product key with item

Legit key, worked great.

I scratch and sniff open the Product Key while using a USB loaded with the MS download of Win 10 as my initial install."INVALID ACTIVATION CODE".

I was wary at first after seeing all the other reviews claiming they received invalid keys but figured Amazon's customer support would cover me, if needed

I was still pretty frustrated by this, though, because a sealed copy of windows should have a good product key in it

Not an error on my part reading the key

With the code being located right on the cover, the probability of getting a copy with a stolen key is unacceptably high

Be careful when scratching off the security strip on this item, the first time I did this it took off the product key with it

Which means when the sticker is removed it obliterates the key

They're just telling me to buy a genuine key for $120

I simply scratched off the key, and entered it into the windows install screen

Microsoft said this key will eventually stop working as it's meant to only be used temporarily

Well on the front of that one, there's a scratch off section where you recover your Windows 10 Home license key after scratching off and removing the silver coating much like a lottery scratch ticket

This is the vendors fault for selling already used keys.

Microsoft support claimed that the key had "exceeded the maximum number of activation's" but they decided to activate it anyway.

For under $100 you get an official copy of Windows 10 Home with a genuine license key from Microsoft

Windows 10 installed properly on my new PC, but I could not activate Windows because of the faulty key

Then you might end up, scratching too deep where you'll end up removing the actual paperboard underneath which will damage the license key that's printed on removing it completely