I have just found a manual for your Dell Dimension 4700 Series .
Is this the correct model?
The procedure is different as this is a SATA drive. Forget about the link I gave you before. Use this one.
http://www.webmadeeasy.net/ComputerD...nual/parts.htm
Click on Hard Drives on the left hand side.
You could slave the drive in your machine if you feel you could manage.
You will have to handle the drive very carefully and not drop or knock it at all or it will be possible to damage it
The instructions show how to add a second drive. Have a read and see what you think. Is there no one else you could ask to help you?