I have a Dimension 3000 running XP Professional system and my problem is that after the Dell splash displays the keyboard quits working. It responds before then but after it gets that far the keyboard and mouse do not work anymore. I have even tried to boot with the XP CD, but I use a password so I cant get past the welcome screen. Anybody tell me what to do in this situation??

I did open the setup screen prior to this but was sure I didn't change anything,...... but maybe I did......not sure of much right now......i am lost  as to do next