vostro 3350

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    Reset my Dell Vostro from Win 10 back to win 7

    How do I return my computer back to windows 7 ? Vostro 3350 /express service code 34088574925. Service tag (s/n ) FNRGGR1......It was a gift from my new daughter in law who told me I may need a new product key When I power on the computer it asks me to Choose an Option / Continue...