It sounds like you definitely aren't running the a good PC... I got the currently best AMD processor and my graphics card is around 1/5 of the current best one. And i can record and play BO at full quality with all the settings highest possible. So you are not running one of the best PC's.
The best solution is for sure to get some new hardware. And if you can't afford that you should just lover your settings. You can't boost your FPS if it is lagging. There is a reason the FPS isn't higher than it is.