Here, get this:
On the back of your computer, on the rightside, there will be two large thumbscrews. Remove these screws. Now, you can push the sidepanel back and off.
On your motherboard, you'll see 3 or 4 white rectangles with slots, in the lower left corner. These are the PCI slots.
There should be a screw on the case infront of the PCI slot. Take the screw out, and take the little cover off, and then put your soundcard into the PCI slot. Be gentle, but be firm at the same time. Once it's in the PCI slot, put the screw threw the metal on the soundcard, and into the case to secure it.
Put the sidepanel back on, and put the two thumb-screws back in, and fire up your machine. When the eMachines logo comes up, press and hold F2 until the BIOS menu comes up. Go down to "Integrated Peripherals". Now go to something like "OnChip PCI device" (I'm not sure what the exact name is for your BIOS). Once there, look for something audio related. Mine says "OnChip Audio Controller", find something similar. When you got it, press enter and change it to Disabled.
Press F10, and then hit Y, then enter to save changes. Your PC will reboot. When it comes to the desktop, insert the driver disc to install the card's drivers.
I'm sorry if I just confused the **** out of you.