The SDL.dll error is a problem that's caused by Windows not being able to read this file. The error itself is common for a lot of different DLL (dynamic link library) files, and is caused by the way in which your system will not be able to process the settings and options that are required to run the file.
SDL.dll is used by the "Simple DirectMedia Layer" application to help load up a large number of important settings for various games on your PC. Although the file may be used by games around the World, it's constantly causing errors due to the file being damaged / corrupted, or Windows is not able to access the important information that the file requires to run. In order to fix this, you have to be able to repair any of the potential issues that your PC may have.
The way to fix the SDL.dll file is to first ensure that you can fix the problems that you'll have inside your system, as well as being able to clean out the various problems inside the "registry" database. The first step is to install the Simple DirectMedia Layer application, which will basically make sure that your PC has the software that's needed to run the program. You can download this program from the Internet for free, and install it using the standard Windows Installer application on your PC.
After installing the Simple DirectMedia Layer, it's well worth then replacing the sdl.dll file on your PC. The problem for a lot of system is that the DirectMedia application will have problems with the sdl.dll file, which will lead Windows to run much slower and with a lot of problems. To resolve this error, you have to be able to clean out any of the problems that the file may have, which should ensure that your computer can read it in the future – boosting the speed and reliability of your computer as a result.
Finally, we also recommend using a "Registry Cleaner" to fix any of the problems that the DirectMedia Layer might have. A registry cleaner is a program that's able to fix the various errors inside the central registry database of Windows, allowing it to run much smoother and more effectively. The registry is continuously leading Windows to run much slower and with a lot of problems, making it vital that you're able to repair any of the problems that it may have, which can be done using a program called Frontline Registry Cleaner 2.0
Source by James Henry Tanner