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[Fix] Error Code 0x80070020 Windows 10/11 Update This Error Code 0x80070020 is commonly caused due to the .NET framework installation failure. These are the following ways in which you can attempt to correct this error. Disclaimers: Before you attempt to fix an issue with the Windows update, we highly recommend you take a registry backup and create a system restore point as a precautionary method. In case something goes wrong, we can restore your computer to the same stage and fix the issues. (In case you are not sure how to back it up, talk to an expert for assistance.)