G570 Downgrading from Windows 8 to windows 7

Hi. My G570 laptop comes with a pre-installed Windows 7. I upgraded it to Windows 8.
Now, i want to go back to 7. I don't have a disk.
Please help me. Thanks in advance.
Moderator Note; subject edited.
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hi ecee,
Welcome to Lenovo Community Forums!
If your system originally came with a Lenovo / Windows 7 OS then your system should have a sticker at the bottom with a Product key code.
You can try using the Onekey Recovery Button, If it was not affected by your Upgrade then a REcovery option there should work
If it did not work Then you might need to get an Installer from online or from a Retail WInodws 7 Installer and just use the Product key at the bottom.
Hope this helps
Cheers!
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Good morning.
You're very welcome.
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