How to remedy bow from flooring and from that point on keeping it straight.

Beside taking up the entire floor and starting all over? There isn't a way to get everything to look perfectly straight. But what you could try to do is start the next row straight, use a backer board to hold it in place and continue the installation. Once that is done, come back to the bow and take one or two rows up and rip the necessary amount of boards to fill in the rest of the space. Good luck

Where did you start the install from? The corner?