Bios Upgrade

What i do to upgrade my bios

BIOS TYPE : Award Modular BIOS v4.60PGA
BIOS DATE : 01/17/00
BIOS ID : 01/17/2000-694X-686A-2A6LJAB9C-00
OME SING-ON : S61 R01-F0 Jan.17.2000 Acer Inc.
SUPER I/O : VIA 686 rev 21 found at port 7h
CHIPSET : VIA 82C691 rev 130
OS : Microsoft Windows XP Version: 5.1.2600 Service Pack 2