When you try to install updates using automatic update service or Microsoft update sites, you may get Windows update error 0x800401F3 on the screen of your computer. Occurring of the update error 0x800401F3 in Windows is a very critical error issue that may harm the computer data or components very badly. Actually it happens mainly due to incorrect registry files or due to corrupt or misconfigured system files. In this situation, you should go through some manual or automatic error fixing methods. For automatic fixing or to get rid of Windows error 0x800401F3 automatically, you can download and install Advanced System Repair tool in the computer.