Hi Uday, make sure you installed the same Edition of Windows 10 (Home, Pro . . . etc.) you previously had installed to avoid Activation issues
Go to Settings - System - About, check which Edition is reported there . ..
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I have purchased my HP laptop which had Windows 8.1 64 bit and updated to Windows 10 64 bit, my hard disk had crashed and had to buy new one. I have installed Windows 10 on it now how can i activate windows?
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Hi Uday, make sure you installed the same Edition of Windows 10 (Home, Pro . . . etc.) you previously had installed to avoid Activation issues
Go to Settings - System - About, check which Edition is reported there . ..
Minor hardware changes should not make Windows activation void, unless you installed a different edition which was earlier installed.
Run Activation troubleshooter:
Did you install the correct edition?
The copy of Windows 10 you download and upgrade from will correspond with the edition of Windows you have installed, if it does not, this is why you might be experiencing problems activating:
Windows 7 Starter, Home Basic, Home Premium, Windows 8.0 Core, Windows 8.1 Core will install Windows 10 Home
Windows 7 Professional, Windows 7 Ultimate, Windows 8.0 Pro, Windows 8.1 Pro will install Windows 10 Pro
To find out if you have the right edition installed:
Click Start > Settings > Update & security > Activation > Edition.
If the edition of Windows 10 installed does not correspond with the edition of Windows 7 or Windows 8 you were previously running, then you need to reinstall the right edition.
If the right edition is installed, do the following:
In Windows 10:
Press Windows key + X
Click Windows PowerShell (admin)
Enter the following command:
wmic path SoftwareLicensingService get OA3xOriginalProductKey
Hit Enter
The product key will be revealed, copy the product key then enter it
Click Start > Settings > Update & security > Activation > Change the product key then enter the new product key then click Next to Activate
If you are unable to activate Windows 10 after all the above and you are certain you have the correct edition installed, then please attempt chat support:
Activate Your Windows 10 License via Microsoft Chat Support
Use the following link to directly reach a live agent who can assist you: