I am using a Dell Inspiron Mini 1020 running Windows XP Professional SP3. The keys on the keyboard do not work at the log on screen, so I cannot log in. When I try to enter safe mode, the arrow keys do not work, thus preventing me from entering safe mode. Also, I am able to use the on-screen keyboard to log in, and when I do, the keys all work inside Windows. What is the problem? Any help is greatly appreciated.