Sorry, you won't be able to play the game at all. I have a friend who has the exact same specs, and he ran Arkham Asylum all on low with just 5-10 FPS. So, if you're talking about a poorly coded game, which requires a decent quad core machine, then I'd say this wouldn't even run. The 7025 is an integrated GPU and hence its slower than a FX 5900.
I'm running it on Windows 7. If you change the compatibility to Windows Vista SP1 it works fine. I got my copy of GTA IV on Steam so the destination of the file was in
C:\Program Files (x86)\Steam\SteamApps\common\Grand Theft Auto IV\GTAIV
and the files I changed were
but I think the only one you need to change is
All you need to do is right click on the file, open up properties, go to the compatibility tab and change the setting to "Run this program in compatibility mode for: Windows Vista (Service Pack 2)" and then run the game by double clicking the "LaunchGTAIV.exe" and it should be fine.