I've tried to install the last version of xnview shell extension v3.00 on my 64 bits SEVEN, but I always get this error message:

I've tried a full uninstall and then fresh re-install, as well as installing with another admin account, and tried the zip version, but I always have the same message: unable to register the DLL.
Antivirus NOD32 has been disabled and all my background software also.
Is it just me? Is there a known method to bypass?
Thanks a lot.