Windows 8.1 product Key and upgrade to Window 10

You should already be using Windows Defender in 8.1

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With Windows 8/8.1 The Product Key on preinstalled Operating Systems (HP, Acer, etc) is embedded in the BIOS in the Motherboard, so that the lost and/or worn C.O.A. Sticker problem is no more.

"Windows 10 Embedded Product Key Tool"

https://neosmart.net/blog/2014/windows-10-embedded-product-key-tool/

"We’re proud to introduce the immediate release of our newest utility for Windows users: the NeoSmart Technologies Embedded Product Key Tool. Designed for users of Windows 7, Windows 8, and Windows 10, our embedded product key tool will retrieve and display the Windows setup product key embedded in the BIOS or EFI, allowing you to store it for safe-keeping or use it to reinstall Windows with an official Windows setup image."

You can also use:

"Belarc Advisor - Free Personal PC Audit (Version 8.5c)"

http://www.belarc.com/free_download.html

Or:

"Product KeyFinder"

https://www.magicaljellybean.com/keyfinder/

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You may or may not still get 10 for free, but you first have to see if 10 is compatible with your device.

The free upgrade to Windows 10 offer from Microsoft expired on the 29th July, 2016.

You will have to contact MS support and they may be able to assist you with a free upgrade to 10..

Also read this information:

All the Ways You Can Still Upgrade to Windows 10 for Free

Here's how you can still get a free Windows 10 upgrade | ZDNet

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Upgrade to Windows 10: FAQ - Windows Help - Microsoft Support

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Windows 10 supported upgrade paths:

✔ = Full upgrade is supported including personal data, settings, and applications.
D = Edition downgrade; personal data is maintained, applications and settings are removed.

https://docs.microsoft.com/en-us/windows/deployment/upgrade/windows-10-upgrade-paths

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First thing to do is to make sure that you have the correct system requirements and that your Computer Manufacturer supplies the correct Drivers for 10 for your Model Number.

HP:

http://www8.hp.com/us/en/drivers.html

"Windows 10 System Requirements"

https://www.thurrott.com/windows/windows-10/3884/windows-10-system-requirements

https://www.microsoft.com/en-US/windows/windows-10-specifications#sysreqs

If you read those Microsoft's system requirements for 10, you will find that if you only go on them you will be sadly disappointed in performance.

For reasonable performance should have at least:

2 gigahertz (GHz) or faster processor.

4 gigabyte (GB) for 32-bit or 8 GB for 64-bit

500GB hard drive

DirectX 9 or later with WDDM 1.0 driver

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Detailed information on Minimum hardware requirements:

https://docs.microsoft.com/en-us/windows-hardware/design/minimum/minimum-hardware-requirements-overview

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Some Manufacturers have listed Model Numbers tested with 10 at their website:

HP Products Tested with Windows 10

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If you do have to buy Windows 10:

How to buy Windows 10:

http://www.microsoftstore.com/store/msusa/en_US/cat/Windows/categoryID.70036700

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Thanks a lot , really useful information, 

I could find Windows 8.1 product key - thru Belarc advisor ., it will be useful for upgrading Windows8.1 updates.

As my Laptop is of Year 2015, i think upgrade to Window10 may deteriorate performance and also not eligible for free updates., i may decide to buy a new laptop with window10 and latest hardwares.

You are welcome.

The choice is yours if you wish you buy a new device.

But I have given the link to HP to see if 10 runs on it.

You may as well check.

Cheers.