That system can't be overclocked anyway.
You have onboard GPU and I bet extremely cheap RAM as well. so changing FSB or anything is out of question, it will go instable nearly instantly.
To overclock, you need high quality components which cost 1.5 - 2 times as much as the "cheap ones" currently present in your system. And keep in mind: cheap complete systems nearly always are filled with the cheapest components!
You have onboard GPU and I bet extremely cheap RAM as well. so changing FSB or anything is out of question, it will go instable nearly instantly.
To overclock, you need high quality components which cost 1.5 - 2 times as much as the "cheap ones" currently present in your system. And keep in mind: cheap complete systems nearly always are filled with the cheapest components!