Temporarily disable real-time protection → Launch Steam. If error disappears, permanently add the exclusion.
Now the game will launch without Defender interfering. how to fix unable to load library steamclient64.dll
Before we dive into the solutions, it's essential to understand what Steamclient64.dll is and its role in the Steam client. Steamclient64.dll is a dynamic link library (DLL) file that contains code and data used by the Steam client to function properly. The "64" in the filename indicates that it's a 64-bit DLL file, which is used by 64-bit versions of Windows. Temporarily disable real-time protection → Launch Steam
Overlays inject DLLs into games and can cause conflicts. Disable them one by one: how to fix unable to load library steamclient64.dll