You have nothing to worry about. The difference being you went to a well known retailer and asked them for help, in the "scam or not" thread somebody just called them out the blue and offered "help"
It doesn't matter that this is anything to do with computers, as somebody mentioned on the other thread, if a random stranger knocked on your door out of the blue and told you your car needed a service and they would do it for you if you gave him your credit card details and the keys to your car would you give them to him? I'm willing to bet the answer is no! The problem is, when it involves computers normally rational people seem to glaze over because they don't understand computers and subsequently forget all the common sense rules they would apply to all other areas of life.