Giga-byte has some nice tools to do these things. For the drivers go to the gigabyte site and under support go to 'download center.' Make sure you're doing this in IE. Follow the steps and it'll show you which drivers need updating.
As for the BIOS, I like using the @BIOS program. You can download it from Gigabytes site. After that, download the latest BIOS and extract it. Load @BIOS and have it look at the new BIOS file (.f11). It'll go through and update it. DO NOT shut down the computer during this process......it won't be pretty.