I've just bought an IBM T23 Thinkpad with Microsoft Windows 2000 Prfessional installed (no accompanying disc or handbood as it is a re-conditioned machine). I've used it 5 or 6 times and now it won't load past 'Log on to Windows' I just get the Logon Message 'The system could not log you on. Make sure your User name and domain are correct, then type your password again. Letters in passwords must be typed using the correct case. Make sure that Caps Lock is not accidentally on.' The only thing it will let me do is shutdown. As you can probably guess I'm no techi. I contacted the company I bought it from and they said 'It's a virus, nothing to do with them. They don't deal with software.' Can anyone suggest anything?