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Can I buy an antivirus program in the store instead of buying online?

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My friend has her computer infected with a troyan virus, she didnt have any antivirus in her computer and now she can not do anything in her computer unless she buy the antivirus online but i looks like she has to buy this antivirus and she feels forced to buy this antivirus, but she is afraid to put her credit card number,and i dont know if she can buy and antivirus in the store and put it by herself can she do that or not tell me please i need to know, and thank you.