1. Go to C:\Program Files (x86)\Steam\SteamApps\common\Grand Theft Auto IV\GTAIV\
2. Right click GTAIV.exe, go to properties and click on Compatibility
3. Tick 'Run this program in compatibility mode for:" and change it to Windows 7.
(maybe do gta4Browser.exe and gtaEncoder.exe for good measure I've not extensive tested yet)
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