GTA IV Won't Launch

[Uncle Humjaba]

I just bought GTA IV off Amazon (downloaded through their service). I started it once, and then decided to patch it, out of habit. I downloaded the 1.0.7 patch, installed it, and now the game will not start. I get through the Rockstar Social Club bullshit but when I hit Play or Play (Offline) it logs me in and then nothing happens.

Any ideas?

EDIT: Started in safe mode and now it works in regular... Weird. Mods can delete this.