Crossfire Question

For the past 2 weeks I have been consistently lagging on Crossfire. I have a perfect laptop and perfect internet. BUT I AM STILL LAGGING on FPS. My average FPS was 40fps which is OK but after 2 weeks, it became choppy. My FPS goes from LOW 6.6fps-45.2fps MAX. I don't get it, I'm very angry off my freking FPS.
Can anyone please help me?

If you want, here are my specs:
Compaq Presario C500
Intel Core Duo @ 1.73GHz 2MB L2 Cache
2.5GB DDR2 800MHz RAM
100GB 2.5" Sata HDD
15.6" LCD Screen
Intel GMA 950 @ 256MB-166MHz
Windows 7 Ultimate OEM 32-bit
Avast 5 Internet Security (Silent/Gaming Mode used sometimes)
Intel Graphics Media Accelerator Driver v8.15.10.1930 (Graphic Options set to Modified Secon****ighest to MAX)
Rogers Hi-Speed Internet Express 10Mbps(Download)-512Kbps(Upload)
Ping: Low 10-11 Average 13-15 MAX 600