Vista - Updating the BIOS

Hi i have just bought a new laptop as i fried the MoBo in my last one which i bought in the early days of Vista, not realising what system requirements were for Vista i landed up with a very under resourced in the hardware dept. laptop and i am shure my constant tinkering with the hardware caused the death of it. Which brings me to my query (now that i am overly paranoid about tinkering with hardware) i have been researching and have found there is very mixed opinion on applying Bios updates and was wondering what people here thoughts are? I have two pending Bios updates 1st addresses better support for SP2 and the 2nd improves system performance & LCD panel brightness.
and if i apply these updates do i need to do both updates or just apply the current one, any opinions would be greatfully received.

Bios updates are mutually exclusive (ie, you can only have one installed). I believe that most bios updates are cumulative so if you choose the newest one you should get both of these issues addressed.

Thank you Bobtran, it is assuring to have that confirmed as any other machine i have had has never had any more than one Bios update issued in the time i have had it. Thanks again