I don't know what sensapi.dll actually does, but you might get it to do the setup for you: try running the following from a command prompt:
regsvr32 /u sensapi.dll
You'll need to run this from sensapi.dll's location or type a full or relative path.
If this fails to run and says sensapi.dll doesn't support DLLUnregisterServer (or similar function name, I think that's it) then this method won't work because the DLL is a simple library and not a COM server.
If this fails to run and says it couldn't load the library then the problem likely isn't with the version, but rather that a .dll that sensapi depends on is missing, or something else about the environment won't let it load.
If it runs and tells you that DLLUnregisterServer succeeded, then do the following from the same command prompt:
regsvr32 sensapi.dll
This should result in a message that DLLRegisterServer succeeded in sensapi.dll. If so, this will have fixed up the appropriate regstry keys. If not, then the error message might be helpful.