Help i just discovered my windows 7 is not genuine

[System]

I recently purchased a second hand PC that had windows 7 installed on it. I subsequently discovered that the windows 7 software i had would not pass validation because it wasn't genuine. Can i purchase and download windows 7 from the microsoft website
and installed it on this PC? will i have to uninstall the windows 7 version that is on it right now?

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