I purchased a computer from a large store " chain". It was defective and since I purchased the super deluxe warranty .... I was able to have it exchanged. I've had nothing but trouble with this store. Now I am finding another author's name on a document. Looking further I found earlier dates on the programs as listed "last used date", earlier than the date I purchased the computer. How can I be sure if this computer has been used and is this information going to hold up in any 'type" of conversation...? Thanks for your help!