Laptop keeps switching between 50% and 100% CPU power

[Gecco]

I have an Acer 6530G.
And eventough it's set to High performance it keeps switching CPU speed between 1 & 2Ghz every 3 secs.
It's a AMD Turion X2 2 GHz.
Running windows 7. Is there any chance to disable it completely and always have it on full power ?
I especially notice it in flash keeps stuttering everytime the cpu switches back to 50%.

 

[Gecco]

they're both set to 100% Batt & AC power.

where do I find this QnQ ?

 

[Gecco]

haha ever seen an Acer bios ? The most risky thing you are able to change there is the time

 

[Gecco]

it runs at 2Ghz when in games fine.
whenever it's loading something on flash 2GHZ but every now and again drops back to 1GHZ.

Is there any way I can trick Win 7 to make it use as a Desktop PC Sheme ?

If yes please tel me how to. Many Thanks