I would not recommend using software...
since you don't have ram speed control raising the fsb is risky (in your case)
because you can kill your ram...If you want to overclock that cpu buy and new mobo
If you really insist on overclocking and not buying anything then I can try unlocking
the overclocking settings on your motherboard...the thing is manufactreres like hp, dell, emachines, acer...they all lock the advenced features like fsb or ram speed on purpose so people don't mess with them and then blame the manufacturer for a bad design...
I have software that can unlock the hidden or locked settings in these kinds of bioses...so if you can save your bios and send it to me I can try unlocking the settings and sending you the new bios back...PM me if you're interested...