Hey,
I recently bought GTA IV and I brought it home and I attempted to install it on my computer. I verified that it worked prior to installing any mods. Once I came to your site, I watched the Tutorial video and completed all steps on that checklist. From there, I attempt to run GTA IV as an administrator, it starts to load the game, it brings me to the Social login page, but once I sign in, the game just stops. I've watched this on my Task Manager processes tab and it appears but then shortly after it loads, it disappears.
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