Dynamic Link Libraries (DLLs) are code libraries that are used by Windows operating systems and various software and device drivers on it to perform various functions. These files can be shared across multiple programs and therefore, they help in reducing the size of an application by minimizing the need to incorporate the same code again and again in different applications.

From simple functions, such as incorporating search features in applications, DLL files can also be used to perform much more complicated tasks such as creating a new module in a programming language.

DLL errors usually occur due to damaged, missing, or incompatible DLL files. For example, Windows XP DLL errors may generate if a DLL file that is incompatible with the operating system is copied and registered on it.

You must be very careful while installing and uninstalling applications. Usually, when a new version of a DLL file is overwritten by an older version during installation of a a program, or when a shared DLL is removed when you uninstall a program, Windows prompts you on what action you need to take.

To prevent DLL errors in this case, it is recommended that you do not overwrite a more current version of a DLL file with an older version, and also while uninstalling do not delete a DLL file that is shared across multiple applications on the computer.