A variety of causes exist for these annoying dll errors the most common of which is the replacement of a working dll file with an older one by a program installation or the removal of such a file during a program’s uninstallation. Also a possible cause is damage done by malware, such as a virus deleting crucial dll files from your computer. Yet another way for a dll file to become corrupt is a hardware problem, usually with the hard disk, that causes data loss.
In all these cases, the problem is usually resolved by downloading and reinstalling the necessary files. A number of articles are available on how to do so.