It always returns the same error when I try to start the game:

 

 

 

Error during initialization:

Couldn't load fileSysCheck.cfg. Make sure Call of DutyВ®: Modern WarfareВ® 3 is run from the correct folder.

Is it just fileSysCheck.cfg, the whole iw_00.iwd, or the whole "main" folder? The error itself is related with iw_00.iwd, but rare are the cases when only that is missing.

Post here a screenshot of your "main" folder.

here the screenshot

Yap, your iw_00.iwd is incomplete (some 10MB missing)

Since you have there localized_german_iw06.iwd, I can see that you used hldsut...

delete ClientRegistry.blob, InstallRecord.blob and HldsUpdateTool_49.mst, and then run hldsut again to replace that damaged iw_00.iwd

hldsut? and I only have Clientregistry.blob

HldsUpdateTool.exe and a batch to launch it. That's how you got localized_german_iw06.iwd

i downloaded from steam, the dedicated version

Ok, then do a steam check on it.

ok it is updating

now I dont have the servers listed, i have the normal lobby... :|

after restarting the game again it worked

good to know.