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This error occurs because.

  1. Registration for MSI software updates fails.
  2. The installation files for the .Net framework have been corrupted.
  3. The operating system failed to install a system.
  4. The Microsoft office source engine has been corrupted and disable.
This type problem can be displayed this error code error. you can fix this using easy step .
  1. And Most importantly you can fix this problem if you reinstall your .Net Framework that it can be fix.
  2. But before this process you will be remove the old .Net framework file kin your PC after that so this process.
I have another method too is this error, with the help of these method you can also fix your error code 0x80070643 error in windows.