I need to recover my Windows 7 serial key after upgrade

Hello. Well, a few years ago, I bought a PC with Windows 7. A update my operating system to Windows 8 Pro (original) last year. Two months ago I have upgraded to windows 8.1 Overview.
My cons:
-PC warranty expired three years ago. So I can't call the supplier for the series.
-L' label with the serial number is the damage. I have only 4/5 of the key. I need the first five characters.
My question is:
-J' I retrieve my serial number of Windows 7, I'm having some trouble if I downgrade from Windows 8.1 Overview 7 8 and later?
-Can I retrieve my serial number of my 4/5 of it?
The reason is that I need to try a virtual Windows 7 machine in Virtual PC, but I need the series. My last question is: can I re-use my serial number on my VM?
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Option 1:

If the COA sticker is damaged, you must use the recovery partition to reinstall Windows 7, it will be exempt from the need to use the product key to activate your installation of Windows 7.

Option 2:

If your recovery partition is not available or damaged, you must contact the manufacturer of your computer, and request that a defined recovery disk you can use to reinstall Windows 7. They could practice a small shipping and handling. This will exempt the need to also use the product key.

Option 3:

If neither options 1 or 2 is possible, then you will need to invest in a new license of full version of detail.

New computers coming often pre-installed with Windows 7 have what is called a recovery partition. This is used to reinstall an operating system in the case of a system failure. To access it, you need to start when you start your computer by pressing a function key. This can be either F1, F2, F9, F10, F11, F12 key DEL or tab. See the manual that came with your PC for instructions on how to reinstall Windows.

This is how the recovery partition is accessible to most popular brands...

For Dell, press CTRL + F11 directly after switching on the device

For HP, press F11 directly after switching on the device

For LG, press F11 directly after switching on the device

For Toshiba, press and hold "0" BEFORE and during the power upward

For Acer, press and hold ALT + F10, as soon as you see the logo

For Asus, press F9, as soon as you see the Asus logo.

For Samsung, press F4 to the power upward...

For Fujitsu, press the F8 key directly after the power

Advent, restart your computer. Then, press F10 repeatedly until the message "Starting system recovery"

Sony VAIO, reboot and press "F8" or "F10" repeatedly until the screen "Advanced Boot Options".

You cannot use the license of Windows 7 on the COA sticker in a virtual machine if there is no host operating system or if the license is already in use.

Tags: Windows

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