As UTR has already said “many BIOSs are setup to allow for easy overclocking” and if you are
running an AMD CPU with an AMD chip-set mobo then there is the AMD Overdrive software that
allows for easy overclocking. As said before many of the mobo manufacturers offer some form of
free overclocking software I know Gigabyte offers what they call EasyTune 6 overclocking software.
Yes some more info about what hardware you have would greatly help in pointing you in the right
direction for overclocking software information.