Give the exact model of your A 100 (like A100 528 or A10 036 etc) and the components you have. You can use a free tool called Speccy to find out your components. Then you can search by the individual component companies for their driver. For example, for your sound driver, go to Realtek's site (i am guessing). Similarly for graphics, network, go to the manufacturer site according to your model.
Also here's a few sites that may help you
https/driverscollection.com/?H=Satellite%20A100&By=Toshiba
http
/drp.su/drivers/notebooks/?v=toshiba&m=SATELLITE%20A100&id=34757&l=en
http
/www.drivertoshiba.com/satellite-drivers/toshiba-satellite-a100-windows-xp-drivers.html