FPS Goes down to 12 suddenly!

When im playing the game my fps is like 50 fps and as i play suddenly my fps goes all the way down to 12fps for like 10 seconds and then goes back up and this repeats throughout the game, i have all the latest graphic drivers and the latest directx.
My computer specs are:
OS:Windowows XP SP2
Processor:Intel(R) Pentium(R) M Processor 1.73 GHz
Memory:2 GB DDR2 RAM
DirectX:10.0
Graphics Card:Mobile Intel(R) 915GM/GMS,910GML Express Graphics Card with 128 MB

This didnt happen before and i didnt do anything to the computer, i've tried wiping my partition and starting from scratch but the problem still persisted.Crossfire used to run fine before but, i dont know what happend.
Help please,any suggestions are welcome.

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