It has numerous reasons it at the origin of contaminated DLL.
One of the most important reasons is the infection by the willful software (virus, poetry, software spies) which are often used as components of numerous types of willful software such as Agent. CS or Virtumonde.
So, UnDLL Remover (an utility of cleaning offered by the famous business company ESET (Nod32)) research, then, abolish the infected files DLL, abolish entries in the register Windows of their keys of register.
However, make sure to close all active applications on your PC before performing the scan and the abolition of contaminated DLL. One will ask for an upturn you at the end of the scan...
It is a tool furthermore in the conflict against willful software, and to eat every Helper should have in her limp in tools.
It is hard recommended to ask for the opinion of an expert of disinfection virus / security via the forum CCM.
This software is not to take in the light, this last do not make subscriber trunk dialling of scan for you, it belongs to the user to choose which DLL or file to be abolished... Thank you for taking warning well this in count...