Vista->Bios->Overclocking help!

Okay, im really new at this but heres what i need help with. First of all i dont know which buttons would get me into bios, i tried f1, crtl alt s, ctrl s, and ctrl atl ins. I am trying to Overclock my cpu from 2.1 to around 2.8.. I know for XP its easier to get into ur bios but can anyone help me?

Also tell me if i will have any problems for overclocking:
Vista 32bit
Asustek Narra3.302
AMD 8400 x3


Thanks!