The file d2multi.dll is part of Diablo 2 from Blizzard Entertainment, used to connect to battle.net.  This file is frequently hacked to create modifications to the game, and the copy on your machine may not be an official version if you have downloaded and installed a game cheat.

If you get an error with this file and still want to play Diablo 2, you may have to completely reinstall the game to fix the error.  You can also run a registry check and cleaning to attempt to fix this without a reinstallation.  Your registry is a complex database that tracks all the files installed on your computer.  Windows uses the registry to find and run programs.

It’s a good idea to regularly check your registry and fix any errors.  ZookaWare PC Cleaner is a registry cleaner that will find and repair any problems in your registry.  Run ZookaWare PC Cleaner whenever you see a dll file error to fix the issue.  ZookaWare PC Cleaner will fix every error in the registry, guaranteed.