Is the money taken from the wife to buy a car, which was in an investment bank, halal or haram, and what should I do with the car after spending a lot on renovating it?

It is not permissible to benefit from the usurious interest on this amount. The wife must dispose of it by spending it on charitable causes. As for the principal amount, there is no harm in benefiting from it. The car purchased with this loan is your property, and you are not required to dispose of it.