Right, lets get you through the bios part first!
Am I right in thinking that you are able to get into the bios OK? i.e pressing DEL on boot up brings up the bios screen?
If so, then the exact location of the integrated devices in the bios will depend on which bios you have unfortunately. When the bios screen first opens (i.e main screen), you may only see a list of sub-headings or menus. These will be listed something like 'Advanced Bios Setup', 'Integrated Peripherals', 'Power Management' etc.
Other bios's open straight on the first page, where you will see the date & time listed for example. This type of bios often have a menu bar along the top instead with items such as 'boot', 'advanced' etc listed.
Let me know which one of these yours looks like & let me know what menu headings you can see.
Its also possible on older machines such as this, that the integrated peripherals are enabled/disabled through hardware jumpers, instead of in the bios.
Is the computer a major brand PC such as Compaq or HP for example? If so, can you tell me the make & model of the PC?
If the computer is a generic make however, then it would be extremely useful if you could find the motherboard make/model itself.
In order to do this, you will need to open the computer up & look on the motherboard for this information. You will usually find it printed on the board either near the centre or in between the PCI slots. Occasionally it will be written along the edge of the last ISA slot but this may be a pain to read without removing the board from the case!