I got to thinking about what I may have done to have caused this (since I've discovered that I am sometimes my own worst enemy!). I remembered a few weeks ago I moved all of the TXT files out of the DBA directory with the intention of deleting all of the junk. I got this hint off of the user forum as a way to speed up some directly file lists on DBA since Windows would not have to sort through and filter all of the unnecessary files.
So, since I had not yet deleted the segregated TXT files (thank goodness!), I sorted them by date and noticed a file named BKMENUSU.TXT. When I opened it there was what looked like menu configuration info. So, I copied the file back to the DBA directory and TA-DAH! I can now login as Admin.
So, as usual, it was my own monkeying around with things I didn't entirely understand that caused this. Wanted to post this in case anyone else ever gets in this situation so that they know how to fix it.
Chris