System Error: A new guard page for the stack cannot be created
I, get also this Error! (GTA.exe - System Error, A new guard page for the stack cannot be created) Please HELP!
On a thread on the Steam forums (for a different game I might add), someone identified this problem being caused by a .Net framework installation error.
They used a tool on this page to remove their .Net framework: https://blogs.msdn.microsoft.com/astebner/2008/08/28/net-framework-cleanup-tool-users-guide/
And then reinstalled the .Net Framework again. It might be worth giving that a try.
@c0der7 This usually happens to me if I have too many replace vehicles. Try reinstalling your mods folder.