GTA 4 is compatible with Windows 10.
GTA 4 is compatible with Windows 10.
It requires some adjustments for current systems (like turning off limits, reinstalling Games for Windows Live, updating the game, etc.). Once those changes are made, it should work properly. *Note: Unless your PC is very weak, GTA 4 performs worse than GTA 5.*
The computer has worked well with Windows 10 from the start. Your friend had to make changes so the game could load past the social club, but it seems those issues have been resolved now.
Your computer will manage it smoothly even at full power (possibly using maximum or high settings if a graphics driver is installed). I didn’t check your specifications before you said no.