[Por_sha911]

Apparently there is a malware that corrupts that dll.

Try using MWB Cameleon:
http://downloads.malwarebytes.org/file/chameleon

It works when the malware is blocking MWB. If you can't get to it from your machine you may need to download it from a clean machine and run it off a jump drive. As a rule, I always try to clean a machine while in Safe Mode.