In you case I think is a missing or corrupt Xvidcore.dll
There can be many different causes of missing or lost DLLs.
1.) The simplest cause that may lead to a missing DLL is that the DLL was deleted by mistake. This may happen if a user is trying to remove a file with a similar name and deletes one of the important DLL files. Many times, DLLs go missing when some another application overwrites the existing DLL with an older version of the DLL.To fix the missing DLL error, you must search for the latest Xvidcore.dll on the Internet and download it to your computer. Copy the DLL into the directory where it was originally located and then register the DLL again using the Regsvr32 command. To do this, select Start > Run and the type “Regsvr32 /i <DLL_Full_Name> and press Enter. If this does not fix the error, download the XviD codec again from the XviD website and reinstall the codec.
2.) Registry problems are one of the major causes of errors related to DLLs. Whenever, an application or a utility is installed on your computer, its DLLs are registered in the registry. The registry is the backbone of your Windows PC, it works hard to provide all the required information to enable your PC to operate as desired. In the process, a large amount of information is added to or removed from the registry. This leads to uncontrolled growth of the registry that may eventually corrupt and fragment the registry. In due course, this damages the registry and may corrupt various entries added to it and cause frequent system errors and crashes.To fix these problems, you will need to scan the registry for errors and remove them. To do this, you may use a registry cleaner software such as RegGenie. This tool provides you with simple-to-use options that helps you automatically scan and repair registry errors. This tool will also help you in compressing the registry and thus, optimizing the performance of your PC.
3.) Spyware and backdoors are also a major cause of concern. These malicious programs gain access to your PC and plant DLLs and files with names similar to or the same as existing or other legitimate Windows files.To prevent these malware infestations, you must keep the antivirus and antispyware software on your computer updated with the latest definitions and run regular scans to identify and remove malicious files or processes from your computer.
I am not sure if this can help you, here are couple links with some very useful info.
