Quote from the Law:
"the lack of goods (works, services) — mismatch of the goods (works, services) or mandatory requirements stipulated by the law or in the established order, or Treaty provisions (at their absence or incompleteness of conditions usually imposed requirements), or the purposes for which goods (work, service) such is usually used, or the purposes of which the seller (executor) has been advised by the consumer in the contract, or the sample and (or) description in the sale of goods by sample and (or) by description;"
Let's say you informed the sales assistant that the computer needed to work with 1C, and they sold you the Mac, so white and beautiful, but without Windows. Then a ride.
You can try with store management to talk may voluntarily agree. Give an argument that you've seen in the Internet-shop on the return, you believe it, but I saw on the way home from their shop and decided to buy off-line. And here such situation.