My IBM 600e laptop won't boot up. On starting, a small picture of a paddlock appears. When I hit enter I get an error 173 and error 163 and the computer won't do anything. When I see the paddlock picture, it allows me to type in a password or something up to 23 characters. It allows me to do this 3 times and then it locks me out. Any ideas what may be causing this? I just replaced my battery yesterday and the next time I turned on the computer, I had these problems. Any help will be appreciated. Thanks.