Thanks scook, I just did that after reading your reply. Unfortunately, I'm getting an error message:
Unable to register the DLL/OCX : Regsvr32 failed with exit code 0x3.
I'm guessing it tried to install a 32 bit plugin, even though I specified 64 bit at the first screen. I'm going to hit Abort, as I don't want to hit Ignore and Retry doesn't do anything. Now it's rolling back, so I guess it didn't make any changes.
At this point, perhaps I'd better contact technical support - I don't want to keep wasting your time. I appreciate all of the help, though!