Error Code 126 usually means Windows can’t load a required DLL.
Common things to check:
Install / repair Visual C++ Redistributables 2015–2022 (both x86 and x64)
Install DirectX End-User Runtime (June 2010)
Check antivirus / Windows Defender quarantine and whitelist the entire Plutonium folder
Make sure the game files are fully extracted and not missing any DLLs
Avoid long or weird install paths (use something like C:\Games\Plutonium)
Run Plutonium as administrator
If it still fails, the error message sometimes mentions a specific DLL — that usually points directly to what dependency is missing. Knowing which game (BO2, MW3, etc.) and Windows version also helps narrow it down.
Hopefully one of these fixes it.
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