You have to unload Media Bar from Windows Startup to prevent it from launching when starting Windows. You may refer to the following procedure for unloading of Media Bar.
1. Go to [Start] -> [Program] -> [Media Bar] (or [Digital Media Park] in PCG-C1F) -> [AV Player Setup]. The [AV Player Setup] dialog box appears.
2. Click the [Add to StartUp] tab.
3. Clear the [Add Media Bar to StartUp folder] checkbox.
*For Media Bar Ver.3.*, the checkbox displays [Add Media Bar Launcher to StartUp folder] instead. Clear this checkbox in the same way.
4. Click [Apply] and [OK].
Settings to prevent Media Bar from launching when starting Windows is completed now.