Error 0x80071129 is caused by the corruption of a system file. This happens when there are problems with the operating system, such as a virus infection or malware. You might see this error code when trying to open a corrupted file, or even when trying to run a program that requires a certain file. When this error appears, it usually indicates that something is wrong with one of your files. If you receive this error while running Microsoft Office programs, you could be missing some important information.