I have Battlefield bad company 2 installed and i cant run it on low settings without bad fps even though the specs for my system are an Intel Pentium D dual core 3.0 GHz and my video card is a 9800?

It seems that your system is struggling with Battlefield Bad Company 2 due to its aging hardware. The Intel Pentium D is quite outdated, and while the 9800 graphics card was decent in its time, it may not handle modern games effectively, even on low settings. Consider upgrading your CPU and GPU for better performance, or try lowering the resolution and disabling additional graphical features to see if that helps improve your frame rates.