hi korndud,
I have no experience with Acer, but it's most likely like other OEM PCs (like Dell, HP, eMachines, etc). OEM PC's cannot be overclocked do to their lower quality motherboards and crippled BIOSes. overclocking requires higher end components (cheaper components are generally operating at their max and cannot be pushed any further)
windows based overclocking programs (like clockgen) will overclock the entire system including the video card, PCI cards, HDDs, etc which can lead to all kinds of problems. to overclock to any significant amount (and to have the overclock run stable) requires it to be done via the BIOS. if your BIOS has settings like CPU multiplier, FSB, VCORE, VDIMM, memory speed/ratio then you may be able to overclock (depending on the hardware quality). if your BIOS does not have any of those settings, then you cannot overclock unless you replace the motherboard with an aftermarket motherboard with a full featured BIOS.
cheers :wave: