Problems with filesystem dll

Hi,

I'm trying to launch the EFS, but it says that "Could not find the filesystem dll to load".

I have the last Steam and EFS versions, and I've read the FAQ's and Manuals, but didn't find the answer.

Does somebody know what is it? How can I solve this problem?

Thanks,

elendur.

Firstly, it is ESF not EFS. Secondly, did you try to reinstall? Do you have it in the right folder SteamApps\YourEmailHere\Half-Life\esf?