open up your comp and see what slot is free. 6100 is integrated video, so you better hope you have an empty video slot.
if you have a slot that looks different from the regular PCI slots (and is usually the one closest to the cpu), then you're in luck, you have either an agp or pci-express slot. go look at pics online to see which is which. if you don't have an empty slot, then sorry, you can not upgrade your video (unless you get new mobo).
thats what sucks sometimes about buying ready made systems...
"Is virtue a thing remote? I wish to be virtuous, and lo! Virtue is at hand." -Confucius