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How to force "Register DLL"?

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Ath:
And what have the supplier of that DLL been able to tell you about this issue?

RegSvr32 normally always forces registration, but all it does is call the entrypoint for that, inside the DLL. If it fails, it's directly to do with the environment of the DLL, so Access denied, can be either or both access to a file, access to the registry, or missing dependencies.
Do you need to update some (MS C++?) system DLL's first, before this one will stick? (Windows Updates does wonders sometimes, even on Vista ;))

Carol Haynes:
Have you tried unregistering the DLL and removing it and then registering the new version. You might need to use Safe Mode to unregister it and remove the old version if it loads with windows.

If it was installed and being updated it might be giving an access denied because it is actually in use.

Alternatively can you completely uninstall QTTabBar and manually ensure that it is totally removed before installing the new version? (I find the registry cleaner in CCLeaner handy for tracking down registry bits and pieces that should have been removed).

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