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DLL (Dynamic Link Library) is a collection of small programs, small programs which contain commands and/or data that are common to a certain task, the executable program (EXE) that is running. The DLL lets the executable communicate with a specific device such as a printer or may contain source code to do particular functions.
The advantage of DLL files is that, because they do not get loaded into random access memory (RAM) together with the main program, space is saved in RAM. When and if a DLL file is called, then it is loaded. For example, you use Microsoft Word document and if you want to print the document, then the DLL printer file is loaded in the RAM.

Which are the causes from error and how you can fix the rundll errors?
How to Find and Delete Rundll Errors
STEP 1: IDENTIFY
The first thing you must do is to identify the specific rundll process. This is not a difficult task; there is a vast online process library in which you can evaluate the validity of the process that is running. When the error dialog box opens make not of the process name. For example if the dialog pops up and shows you the dll error:
Error loading C:WINDOWS\ system32\ usvdgpo.dll
More how to find and delete rundll errors
How to fix a rundll error
Solutin 1:

To be able to locate where the error comes from, you can make use of internet tools or choose to fix it manually.
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Solutin 2:
RunDLL Error Repair
Now, as we suggested earlier, DLL do go wrong some times, so it is important that you know how to fix them. In particular, in this case, you need to know how to repair rundll in both it’s 16-bit and 32-bit guises.
First, the good news is that it is certainly possible to repair rundll. Indeed, depending on the way that you choose to repair rundll, it can be an extremely easy operation.
How you decide to go about implementing the necessary repairs for a malfunctioning rundll or rundll32 will be dictated by two factors.

