Many DLL files are there that are responsible for the proper running of the Windows computer. The DLL files are associated with the applications installed in the Windows. When these DLL files get corrupt or removed from the system, you may get several DLL errors like 3ivx.dll is missing error in Windows. After the occurring of this error, you cannot be able to access the applications associated with it. Actually, 3ivx.dll was not found error is a very critical error issue after occurring of which, you cannot be able to run the computer properly. So, it is very important to abolish the error issue as soon as possible. You can fix this issue in two ways, either manually or automatically. For manual method, you should be a vast technical knowledge. For, automatic method of error troubleshooting, you can use Advanced System Repair tool in your computer.