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Windows 7 product key does not work on Windows 10

I just did a fresh Window 10 installation from .iso files on the computer I was running Windows 7 on before. I have the original Windows 7 DVD's, with a valid key that I was using before.

Now I tried to enter the key of my Windows 7 DVD, but Windows 10 says it's not valid.

As far as I knew we were able to use those Win 7 keys on Win 10. What is wrong?

How do I retrieve a product key from another hard drive?

My friend's laptop motherboard died and he needs his Windows 7 product key from the hard drive (which is still working).

I connected the old drive as a secondary drive to my own computer and tried using a key finder utility, but it just keeps showing my own product key and not his.

Is there a way to retrieve the product key from the old drive using my computer?

Determine if Windows 7 is 32 or 64 bit from the product key?

Unable to start Windows to determine whether the version of Windows 7 Home Premium is 32 or 64 bit. The product key is available. That is all I have.

Looking to acquire re-installation media but need to know the correct version. This requires choosing which version was originally installed, 32 or 64 bit.

Is there a way to determine if 32 or 64 bit was originally installed from the product key?

Internet search has only shown how to find the key (which I already have). This is not a duplicate of; Is there a way to establish what version a Windows 7 product key is? which installs software to check. Can't do that in my case.

Exchanging a brand new laptop because of a dead pixel, is there any way to re-validate my Microsoft Office product key?

I just bought a brand new laptop (Toshiba Satellite L655-S5155) and realized AFTER I had installed Norton 360 and Microsoft Office Home and Student 2010 that the monitor has a dead pixel.

I'm exchanging the laptop, since I haven't done anything else with it but would like to know if there's any chance that a system recovery or system restore would enable me to use the same product key for these programs on the new laptop?

I know the Norton 360 can be used on up to 3 devices, so I should be able to use it again but the Office Suite is not so flexible. The only reason I'm apprehensive about having the store simply give me a new suite is because the FIRST issue I had was with them giving me the wrong computer so they have already given me a new Office Suite once before. I'd hate to ask for another one for free if I can avoid it.

How to recover Windows Vista product key?

Two years ago I bought an Asus laptop with Windows Vista pre-installed. I also received a recovery DVD with it. I now want to reinstall Windows and fully format the hard drive - however, the sticker with the Windows product key under the laptop is unreadable.

I tried recovering the key with ProduKey and similar software but they show another product key - it is different from the sticker's key (I checked on another Asus laptop and on my Dell laptop).

Is it possible to reinstall the operating system with the product key obtained from ProduKey? If not, how can I retrieve the product key? It seems stupid that it was only placed on the sticker that is destroyed after some time if you frequently hold the laptop on your lap.

Difference between Product Key and Serial Number

I just wanted to extract my activation keys of Windows 7 and 8 x64. I used several programs to test, if they produce the right results. In System screen > Details about windows activation I can see the last five digits of my currently used installation key. I used the programs Speccy and License Crawler.

License Crawler yields the right code which is called Product Key. Speccy on the other hand yields a Serial Number, which also has the format XXXXX-XXXXX-XXXXX-XXXXX-XXXXX, but is not the actual installation key.

So what is the second code (Serial Number) about?

How to change the saved Office 2013 Product Key

I installed Office 2013 and put in the product key when it asked me to. After typing in the product key, it allowed me to use MS Word once. After I closed MS Word and went to reopen it the next day, it said the product key I entered was incorrect (maybe I typed it in incorrectly). It asked me to change it. I tried opening MS word and clicking File -> Account but was unable to change the product key from there.

I then went to control panel -> uninstall a program and then clicked on Office 2013 and clicked 'change' but it gave me no option to change the product key. So I decided to uninstall and reinstall it.

I uninstalled it and then went to reinstall it with the setup file and now it is giving me an error saying:

Error 25004. The product key you entered cannot be used on this machine. This is most likely due to previous Office 2013 trials being installed.

The first product key I entered seems to be saved somewhere. How do I delete / change it?

Does Windows Impose a Performance Penalty For Not Activating Windows With a Product Key? [duplicate]

Possible Duplicate:
Windows 7 activation period

Does Windows 7 impose a performance penalty for not activating Windows with a Product Key?

Let's say you have a very old installation of Windows 7 that has not been activated. The number of days they give you to activate is long expired. You've already used up your free slmgr rearms. Basically, you're to the point where the software can conclude that you're just not going to buy a legitimate Windows license, yet you continue to boot the operating system.

Now, the operating system's boot and operation slows down to about 5% of the performance you experienced when you first installed. Is this a documented (or discovered) anti-feature of Windows that intentionally slows down an unactivated product? Or, is this likely some kind of hardware or driver issue?

Downgrade from Windows 7 Ultimate to Home Premium?

A few months ago, I acquired a Windows 7 Ultimate product key and updated from Home Premium to Ultimate. Well, now I get the "This copy of Windows is not genuine" message. I have the Home Premium product key that I was using before I upgraded to Ultimate. I would want to know how I could downgrade from Ultimate to Home Premium without having any CD and only the product key. If it helps, it's a 64-bit OS. Thanks in advance!

Where can I download a rescue disk for Windows 8?

Where can I download a rescue disk for Windows 8? I have paid for Windows 8, but I would like to be able to download a Windows 8 repair disk using my product key. Is this possible?

Installing a different edition of Windows 8 on an OEM system

My PC comes with an OEM copy of Windows 8 (regular), but I only have a Windows 8 Professional DVD. Will Windows 8 automatically detect the edition associated with the product key in my BIOS and install Windows 8 (regular) instead of allowing me to enter the key for the Professional edition?

(I have an Asus Q200E Win 8 Core OEM laptop. I borrowed a Windows 8 Professional DVD from my friends, so naturally, I can’t use his product key.)

Check if Windows 7 product key has been used

Selling my Windows 7 as used to someone, however, I have lost track of whether the product key is still used on an old PC of mine.

Is there any quick way to check whether a product key has been used or not? (Without going through the install and activation process).

N.B: It's all a legitimate purchase from Microsoft!

EDIT: I have found a piece of software which checks if the product key is valid, but not sure if the information displayed shows if the product key is already activated (refer to screenshot section on the link)... The link to the software I found is at http://www.softpedia.com/get/System/System-Info/Windows-7-Product-Key-Checker.shtml

Find the product key I entered for MS Office on Mac

I have several legal license keys for Office:mac 2008. I want to do a quick audit of the two machines I've installed office on and verify which license keys are being used where. But I don't see the license key anywhere on the about dialog (or elsewhere).

I've seen other postings on the 'net directing me to look at various .plist files, but those only give me the "Product ID" which is different from the license key (which MS calls the "Product Key" on the little sticker).

Is there a way outside of calling MS to correlate the Product Key (which is required for installation and is the real license key) to the Product ID I see in the app itself?

New computer purchased without COA or Product Key

My brother recently purchased a new computer with Windows 7 Home Premium 64 bit installed on it. He got it from either an individual, or a company, I'm not sure which. The problem is, when he first powered on the computer it asked him to activate Windows.

So naturally he went through the screens of activating it but it said it couldn't be activated. No where on the tower does it have a COA with a product key. Even going through the BIOS I can't find anything. He contacted the people he bought it from and apparently they told him that they don't supply any product keys and he basically has to purchase one to get it activated.

So here's my dilemma; can an individual, or company, sell a computer with Windows installed but not supply a product key? If he can't activate it, is he out of luck (and out of $$) having to purchase a copy just for a key? Isn't there some compliance regulation that you have to supply a COA or key when building/selling computers?

Office 2013 Trial Error 25004

I had some issues with getting an Office 2013 Professional Plus 2013 trial when I first installed it from TechNet, and I had to reinstall it. When I tried to activate it after reinstalling, I got the error Error 25004. The product key you entered cannot be used on this machine. This is most likely due to previous Office 2010 trials being installed.

I didn't use up my trial period, and I only had it running for about a day before uninstalling it. I've tried everything, removing registry keys (HKLM and HKCU\Software\Microsoft\Office), removing files from Program Files, AppData, and ProgramData, and even got rid of some files from C:\Program Files\Common Files (Office, OfficeSoftwareProtectionService, Source Engine).

I really don't want to have to format my hard drive and reinstall Windows.