Thanks for the response. I downloaded tunes again, and tried a reinstall, but it fails. I redownloaded iTunes 8.01 and tried again, getting the failed notice again.
Edit - Now the whole thing is sluggish. I try to delete iTunes to do a full reinstall, and it fights back. I'm about to do a full factory reinstall on my macbook if this keeps up, and not get iTunes 8 at all.