There are certain software designed specifically to detect and repair registry dll files that are corrupted due to system crash, viruses and other problems. You can use those tools, called a registry cleaner, that has the ability to fix corrupted file associations, which in turn lead to dll files running as they should.
Sure, there programs that fix registry associations but most registry cleaners simply allow you to remove invalid entries. Unfortunately the latter don't usually fix much except pop-ups asking for files because a program removal process has not got shot of the registry entries.
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