I bought a laptop from a well-known brand at a small neighborhood store and later discovered that the Windows isn't original. They say it's second-hand but the store sold it to me as new. Who do I go to?
If they sold it to you as new and then you discover it has pirated Windows, you have the right to file a complaint. First thing is to go directly to the store with your proof of purchase and demand a solution (exchange, refund, or upgrade to a legal license), because basically they sold you a defective product. If the store won't cooperate, you can file a complaint with the consumer association in your autonomous community or contact the General Consumer Affairs Department, they're the ones who handle these matters. You could also consult with a lawyer if the computer cost you quite a bit of money, though normally these organizations resolve things without needing to go that far.
If they sold it to you as new but it has pirated Windows, you have the right to file a complaint for fraudulent sale. First thing is to contact the store in writing (email or registered mail) asking them to fix it or give you your money back, and if they don't respond within a reasonable timeframe, you can go to the consumer association in your autonomous community or go straight to report it to local police.
Of course, the first thing is to go to the store with the receipt and tell them they sold it to you as new when it's not, that's straight-up fraud. If they don't fix anything right there, you can file a complaint with your country's consumer protection agency or equivalent, and I'd also consider contacting Microsoft directly to report the sale of pirated software because they also have an interest in getting things regularized. Depending on where you live, you might also have the right to return the equipment or have them install a legitimate copy of Windows for you, but that varies a lot depending on local laws.
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