How to View Product Key

Open Command Prompt as Admin. Use the Command line below.

wmic os get "SerialNumber" | find /v "SerialNumber"

for /f "tokens=3" %p in ('SystemInfo ^| find "Product ID"') do @echo %p

for /f "tokens=3" %p in ('reg query "HKLM\Software\Microsoft\Windows NT\CurrentVersion" /v ProductID') do @echo %p

Or you can also try the following:

1. Just type the folowing command from cmd:

   reg query HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\\ProductID
   

2. or even:

reg query HKLM\SOFTWARE\Microsoft\Internet Explorer\Registration\ProductID

Or the Other option as well:

1. From command line type the "wmic" and Enter

2. Inside WMI, Type "OS"

3. Look over "SerialNumber" value. It contains your Windows 8 ProductID.

4. PS: Alternatively you could also type "wmic OS" from cmd and search for SerialNumber.

Here is another command you can try with:

wmic bios get serialnumber