My computer was fine yesterday. Today, it behaves like the tortoise in the race. It runs on Windows XP Home. The hard disk still has 44% free space. I clean and defragment the hard disk at least once a week. It's protected by Norton Antivirus so it can't be infected. Can it? Broadband says it is at 576kb speed but it is more like 5.76kb instead. So, why? What could have happened? Please help!