provide us a link to your previous thread. if you look below you'll see a pull down menu labeled "Jump to" select "my postings" you should find your post there.
to flash your system bios, go to the dell support site and look for your model of computer and go to the downloads section. look for the latest bios update. download it. next insert a freshly formatted floppy and run the setup you downloaded. this will copy the program to the floppy. leave the floppy in and reboot. boot from the floppy and the flashing program will start. site back and let it finish. take out the floppy and reboot.
flashing the bios isn't something to be taken lightly , so make sure you don't reboot or lose power to the computer during the process or you will totally mess up your system.