If i have a heart problem or heart disease, can i still lift weights and exercise?

Maybe: Depends on the nature of your heart problem. (If I told you "My car is broken. Can I still drive it?" How would you answer me?)

Yes: It is always advised to do exercise. That include aerobics (treadmill, bike, rowing, swimming, elliptical, etc) You may also do anaerobic: lift weights BUT should be more based in repetitions than HEAVY weights that could increase blood pressure and put a strain on the heart