Requesting a replacement Vista product key is going to be cheaper but if that doesn't work out, you may, in fact, have to buy a new copy of Windows.
Ị rịọ ka isi ngwaahịa Vista na-agbanwe agbanwe ga-adị ọnụ ala ma ọ bụrụ na nke ahụ anaghị arụ ọrụ, ị nwere ike ịzụta ọhụrụ Windows.