In case you have a modern graphics card , GTA 4 may not recognise it and it'll stuck at 800x600 resolution , just copy "commandline.txt" file provided with the repack to your installation directory and then start the game ....

**INSTALL INSTRUCTIONS:

DISABLE YOUR ANTIVIRUS BEFORE RUNNING 'Setup.exe' (IMPORTANT) to avoid any error message . (For avast users: Just Disable DeepScreen in antivirus settings)...

After running setup,, click on 'Configure',, specify the install directory,, click on next and next,, select the necessary software (Direct X and Visual C++ [provided in Redist folder]),, again next,, finally on 'Install'...PLAY THE GAME FROM DESKTOP SHORTCUT ONLY using run as administrator.... 

Always open the game using 'Run as administrator' to avoid any savegame/crash issue, if it still crashes, lower the graphics settings and make sure u meet the system requirements along with updated graphic drivers for your graphics card ...
Grand Theft Auto IV Patch 8 Title Update Notes (PC Only)

Added error code "WTV270" to indicate a problem with connecting to Windows Live Sign in Assistant / Games for Windows Live Servers.
Added Windows 8, 8.1, and 10 to compatible OS check.
Added Display Controller image in Controller Configuration.
Fixed a bug which made completing "Out of Commission" mission impossible when frame rate exceeds 60fps.
Fixed a bug with the "Resource Usage" indicator on graphics cards with more than 2GB of VRAM.
Fixed a bug that restricted settings changes when using modern video cards.
Fixed a bug with the map crosshair on certain resolutions.
Fixed a bug with text scrolling in "Brief" Menu.
Fixed "drawlist overflow" crash.
Minor performance optimizations