My windows 7 instalation cd doesn't work so i need to factory reset Windows 7 without a CD or factory restore point

[Windows 7]

My windows 7 instalation cd doesn't work so i need to factory reset Windows 7 without a CD or factory restore point.When i try to run the reseting and reinstallation of windows 7, i put the cd in and press continue, but the computer says the cd is invalidI would like to clean it, by just erasing everything, and just leaving what there was from the fabric. The computer is super slow and I can't use it for anything as it is, and I wouldn't like to throw it away without trying first.Thanks in advance

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