Purchase used (second-hand) PC with OEM license Windows

You can use the second hand computer you bought wherever you want to.

But you can't transfer an OEM license to any other machine.

When the OEM preinstalled licensed machine dies, the OEM license dies with it.

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It is up to the firm as to whether they want your computer as a workstation if it meets the specifications of what they want in their business and if they will allow it to be part of their Network.

A word of advice: With a second hand computer reinstall the operating system as you never know what it has been used for and it may be infected with Malware..

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To reinstall:

HP – Press F11 repeatedly

http://support.hp.com/us-en/document/c01867418#AbT3

Or you can use this for preinstalled OEM or Retail Licenses

Download the correct ISO file and make your own disk and use the Product Key that is on the COA Sticker.

https://www.heidoc.net/joomla/technology-science/microsoft/67-microsoft-windows-and-office-iso-download-tool

Download: Windows ISO Downloader.exe
Version: 6.00
Release Date: 11 April 2018
Requirements: Windows 7 or newer, .NET Framework 4.x, Internet Explorer 8 or newer.

Important: As of Version 6.00, we're adding back an experimental feature to generate links for Windows 7 and Office 2010. Generation of new links for these products is throttled, and not every download is always available in every language. New links are generated on a first come first served basis, with users who enable the idle resource donation getting preferential treatment. If you have further questions, please use the WinCert Forum to get in touch, so that other users can also benefit from the discussion.

And here are instructions on how to burn ISO images to disk:

http://www.snapfiles.com/get/ISORecorder.html

Then do a clean install:

http://www.sevenforums.com/tutorials/1649-clean-install-windows-7-a.html

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Using the downloaded ISO file Method may require phone Activation.

If it does require phone Activation, do not follow the Auto Prompts, but hold on for a real person to explain to as to what has been done for re-installation purposes

"How to Activate Windows 7 by Phone"

http://www.sevenforums.com/tutorials/18715-activate-windows-7-phone.html

The above method also will require you to go to your Computer Manufacturer's website > Support and Downloads Section > locate your Model Number and Operating System > then download and install the latest Drivers for it.

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Using the USB method in conjunction with the above Windows 7 download:

http://www.sevenforums.com/tutorials/2432-usb-windows-7-installation-key-drive-create.html

"How to Get and Use the Windows 7 USB/DVD Download Tool"

http://www.sevenforums.com/tutorials/31541-windows-7-usb-dvd-download-tool.html

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Or you can also borrow the exact same Retail Windows 7 Edition DVD and use your Product Key to reinstall.

The COA sticker, which has the Product Key on it, is either on the underside of the Laptop or in the Battery Compartment.

With a Desktop it is either on the side, rear or top of the Computer Case.

Cheers.