Upgrade motherboard? i've computermotherboard atc5220 mainboard a-trend mvp3-586b-smc669chipset

Question

i've computermotherboard atc5220 mainboard a-trend mvp3-586b-smc669chipset via vt82c596mvp [appolo vp3]processor amd k6-2 model 8 @501Mhz
i already instal it with windows 2000 but it cant upgrade to windows 2000 service pack 2 or higher..is anyone can help me with update bios and the download link for the bios?and tell me the other way beside update the bios...tq

notei already instal windows 2000 servicepack 2 or higher but the OS always didnt loaded... now i instal windows 2000 with no service pack, the system was ok but i cant instal network norton anti virus that other computer installed and microsoft office 2003 ...