Code Name = Conroe, # Cores = 2,Brand=Intel Pentium Desktop Processor,Processor Number= E2180, Speed= 2GHz.
The only times I've overclocked a CPU is when I have an unlocked part.
If the part is unlocked, the BIOS will let you increase the frequency (at your own risk).
If your BIOS is up to date (see the HP web site) then, if the processor is unlocked, it should show options to change the frequency.
I'm guessing this is not an unlocked part. Usually only some of the 'extreme' processors are unlocked.
There are lots of websites that talk about overclocking but overclocking is way beyond my experience.
And overclocking may violate your warranty (again, you need to see the HP website).
Sorry to not be more helpful.