rockstar social club doesn't "run" as such, its part of GTA mate.
try manually reinstalling social club, youll find its setup in your GTAV folder, I think its in a folder called setup (going from memory
here@work atm) also if you have indeed pushed graphics settings higher than they recommend it wont load as you don't have enough VRAM
so it bombs out.
if not already installed, grab Geforce experience, this allows you to reset the settings back to the best optimisation for your specific NVidia card. GTAV is one title that actually benefits from GF exp and tweaks it very nicely.
whatever you do, don't try to run GTAV.exe as admin (UAC elevated privs) it breaks the exe requiring a reinstall of GTA