Battery and charging problems please help!

Hey guys thanks for reading

I have had so many problems with my Alienware M17x a lot of which is the fact it has pretty much never charged from the day I got it, anyways i have been made to buy a brand new battery and a brand new ac adapter... guess what still dosn't work i can get my system on but that's about it.

because of this a 3000 pound laptop runs terribly wont play barely anything with move than 5 FPS!