I need a new video card for my PC?

What's the best place to buy them? Can I "add on" to my original video card or do I need to buy a whole new one?|||Best buy babe. Good luck ;)|||Can Add or Whatever; Get Any High End NVidia; Best to buy is Upgrade-solutions.com|||geta real card such as radeaon ati or nividia ge force|||goto newegg.com and u have to disable the other video card...message me if u need more help...|||there r some models of video cards that support more RAM, u use laptop ram 4 these graphic cards i don't think u have one of this cuz' this graphic cards aren't built on new PC's u specifically buy one on a computer store, so i think u will have 2 buy a new one . . .