Can this pc ruin GTA 5 WITH MODS

I suggest not buying an OEM copy of windows 8, and if you're going to buy an OS, at least get it off of G2A for $40. (Just make sure to purchase the security for an extra $1-2)

But yeah, that can definitely run gta5 alone, I don't know about mods though.

Gta 5 is really, really well optimized.
Although that power supply is a bit low, if you can I'd suggest getting at least 600-650

(Personal suggestion from an amd fan, I suggest getting the r9 390 instead)

https://www.youtube.com/watch?v=plWeCqnNXoE