Please help something is really off

Okay well... I have been playing CF for way over a year...
My laptop spec's are way past the minimum and recommended.

2.4Ghz Dual
4GB of Ram
ATI HD 4200 Card

I used to get a good 100+ FPS on every single map or game mode.

And this is my problem...
I am constanstly spiking down to 3-5FPS and I can't walk, and if I do I get stuck on averything, walls, doors, anything!

I have to wait for about 30 secs then it goes back to the usual 100ish FPS, and then 3 mins laters goes back dwn to 5 for another 30-45 secs.

I really Don't know what to do, could someone pleas help me out. Thanks

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