Double check your bios, and check it well. If you have an Award bios ctrl+F1 unlocks special options.
Your the only person that would know if you can O/C your own PC. You'll rarely, if ever find, two exact configurations in a PC. If someone even has the slightest change from your configuration, I.E. the PSU's a different brand, it could change the way the PC O/C's. The best way find your PC's potential is read the O/C tutorial and try for yourself. the worst that could happen is you'll have to reset your Cmos a few times.
If you double check your Bios and find nothing. RMclock is a nice software based utility to O/C your CPU.
Hope that helps.