In the Windows operating system, you may get many errors that may harm the computer data or information stored. Windows update error 0x80004015 is one of those error issues. The Windows update error comes to your computer mainly due to registry problem or due to incomplete installation of Windows OS. You will not be able to update the Windows or not be able to install or uninstall any files or apps in the computer due to the occurring of this issue. Therefore, you should go through the error fixing methods provided here in the article to get rid of Windows error 0x80004015. You can also use Advanced System Repair tool in the computer to fix Windows error code 0x80004015.