Found Major Water Intrusion Issues, Please Help!

[Thomas O'Donnell]

Good morning everyone. I woke up this morning to very hard rain and the sound of heavy pouring. I went outside and discovered that the downspout from my top roof to my lower roof not only hangs too far over the gutter, but the gutter also is not draining right. This is leading to a bunch of water pouring straight down at the corner of the foundation. I have negative grading in general on the sides of the duplex (yes I know negative grading is bad for water) and when I went into the basement, I saw puddles being made from holes at the very bottom of the foundation wall. Water was coming in from a few spots and making puddles in the basement. First question, I know my gutters are kind of old and crappy, should I have them replaced or repaired? Second question, how do you fix negative grading on the sides of your house when both sides are concrete walkways that slope towards the house? Third question, how expensive would it be to fix all of these things? I was going to add videos but it is not allowing me to.