I have a general idea of installing a video card, but my system which is an Acer MD 5640 doesn't have an existing card, but is internal I believe. I need to know how to remove the existing graphics memory or drivers, and which ones. I tried to remove the existing NVidia but lost all connections to the internet in doing so. I was able to restore all info and am back to normal. I don't believe my computer has a power supply cord for a graphics card, but I may be wrong. Thanks for any help!