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Run the System File Checker
Maybe a program you recently installed on your computer is the causer of the error code 0x800700b7, as the program might have damaged some of your computer’s system files. In this case, running the System File Checker might help.
To run it, follow the steps below:
Click on the start menu and type command prompt;
Once it appears in the search results, right click on it and select Run as Administrator;
In the command prompt type the following command:
Wait for the process to complete.
If Windows doesn't load, and you are on the Advanced Boot Options screen, navigate to Safe Mode with Command Prompt and press Enter.
Ensure that all the programs are installed and updated
If you get the 0x800700b7 error message, it is possible that there is a program in the computer which is installing at the moment or which is being updated. Ensure that no programs are being installed and/or updated. If there are such programs, wait until the end of the process. If you are not sure, restart your computer.
If you haven't cleaned your computer for some time, make sure you do as soon as possible as your computer might have accumulated too many system cache files, which might be the reason for the error code 0x800700b7.
In order to clear the system cache, follow the steps below:
Press Windows button and R to open the Run box;
Type regedit in it and click OK;
Navigate to the following destination, by clicking on the folders on the left side of the window:
If you tried everything else to fix error 0x800700b7, but nothing worked, consider taking your computer to a repair shop. They will extract your data in a safe way and remove the causer of this error message.
If something went wrong during the system restore process and you got the error message 0x800700b7, try booting the computer to the last known configuration. To boot the computer to the last known configuration, follow the steps below:
Turn off the computer, either by pressing (and holding) the power button or by unplugging it from the power cord;
Turn on the computer and press the F8 button repeatedly. * If that didn't work, press and hold the power button, and the computer should redirect you to the Advanced Boot Options screen;
Use the keyboard's arrow buttons to navigate to Boot to the last known configuration and press Enter.
Maybe the antivirus software is the reason for this error message. Try disabling the anti-virus software, by right-clicking on its icon in the notification area (bottom-right corner of the screen, near the date and time) first and then restoring the computer.
Note: If you didn't manage to disable the antivirus software, go to their website to find out how to do that.
If you get the 0x800700b7 error message when you try to make a backup of your data, try deleting the WindowsBackup folder. Before you do this, make a back of the registry (check out this guide by Microsoft), which you can use in case if something goes wrong.
Open the start menu, type regedit.exe in the search box and press Enter;
Navigate to the following key by clicking on the folders on the left side of the window: