We developed an IE plugin with the firebreath framework. The plugin can run correctly in some environment with Windows 7 and IE10, but can't in another environment with the same OS and browser.
This error message is shown:

We developed an IE plugin with the firebreath framework. The plugin can run correctly in some environment with Windows 7 and IE10, but can't in another environment with the same OS and browser.
This error message is shown:

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It's impossible to be certain, but my guess would be that your issue is your DLL has dependencies which aren't available on the system where it won't load; use Dependency Walker to see what dependencies there are which aren't available.