Question About SQL Server/Query Analyzer And Timeouts

I was given a list of user comments from an old application and told to match it up with our current system.  After all the easy methods I was still left with 95% of the records unmatched.  The only way I had left was to try and match up the names.  Given that people could have the same name I added a count to make sure it only found one record.  This query has been running for over an hour now.  How do I tell if it's actually running, or if it locked up?

Also here is the query I'm using, does anyone have any feedback on it?  Is this poorly written, is my logic wrong?  Did I put the server in a loop?


UPDATE
 user_table_1
SET
 id = s.id
FROM
 user_table_2 AS s
WHERE
 RTRIM(s.first_name) = RTRIM(user_table_1.first_name) AND
 RTRIM(s.last_name) = RTRIM(user_table_1.last_name) AND
 (SELECT
  COUNT (*)
 FROM
  user_table_2 AS cs
 WHERE
  RTRIM(user_table_1.first_name) = RTRIM(cs.first_name) AND
  RTRIM(user_table_1.last_name) = RTRIM(cs.last_name)) = 1