Overclocking

hey guys i have warpspeeder overclocking program that came with my computer. its pleanty cold inside my case now my cpu is only 30c so i wann bump it up to around 45 maybe 50. so i increase the mhz. i start at 200 and the most i can up to is 203mhz bus before the computer freezes not crash only freeze. its overclocking my gfxcard ram and cpu is there any way to just overclock the cpu? and in my bios i have no cpu multiplyer
im running a 3200 sempron amd 2.2 ghz getting it to even 2.5 would be good for me