yeah, work on the english...
anyway, as far as your quieting options go it would help to know what kind of system you have. Is it a custom built pc? If so, what motherboard, many nice motherboards have software that can adjust fan speeds automatically, there is also general software avaliable to do this IF your motherboard can support it.
As far as new fans, I recommend quiet fans, ie: 28 db or less at full RPM's
AMD 64 3800+
X-connect 500W psu
Custom Quake box under planning and soon to be under construction