Can you show me your Programs and features from the date you downloaded GTA 3,Vice City, and San Andreas?
Control Panel->Programs and Features (if you are viewing by small or large icons)
Control Panel->Programs->Uninstall ( if you are viewing by Category)
As of right now I'm assuming one of the GTA series may have installed something from Microsoft, like how GTA 4 installs .NET Framework 3.5 (or 4.0 I forgot which).