Can anyone help me to figure out what kind of dell computer my friend wants to buy?

its from someone who has it that she does not know well... and we need to get info on the particulars and ....how much and when it was purchased she said its still in the box but the only info is a bar code # thats on the back of the product information guide. We cannot even find out the name of it and that seems very strange, not to mention we are in our 50's and ....are really ignorant of the lingo ....and we feel retarted hence the question.thank you guys and its a desk top I believe from 2006