How to Check DLL Files

By Steve Gregory

In the Windows operating system many files work together to operate the software. Many of these files are dynamic link libraries (DLL). These files are important because they enable programs that run on the operating system to function. Each program running on Windows can access a specific DLL to execute a function, such as the ability to open and close dialog boxes. If DLLs are missing or corrupted Windows may become unstable. Fortunately, you can use the System File Checker tool in Windows to find and repair DLL files.

Click "Start," then "All Programs."

Click "Accessories," then right-click on "Command Prompt."

Click "Run as administrator" from the pop-up menu. Click "Allow" or type in an administrator password if prompted by the system.

Type "sfc /scannow" at the command prompt, then press the "Enter" key. The System File Checker will run. It will check for all missing and corrupted DLL files and replace them.