Occasionally issues like system registry instability, corruption of system files and slowing of system performance can lead to such problems. Hardware failure can be an acute cause as well.

In order to avoid this error and get the functionality back, it is advised that users run an anti-virus scan to eliminate the possibility of a virus; and hence the issue of corrupted files can be catered to. The QuickTime app should also be checked for corrupted files as well, since a simple reinstall would do the job for you.

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A recommended procedure for such is to undo the compatibility mode for QuickTime. This should be done when Windows is being used as an operating system. The steps are as follows:

How to Fix iTunes Error 3191 iPhone 4 on iOS 5 / 5.0.1 :

1.In order to do this, go to “Program Files” in your Local Disk (C). A simple search would lead you to the QuickTime Player folder.

2.Upon reaching their, right click on the Player App. In the shortcut menu, you would find the option of “Properties”.

3.In the option of “Properties”, you would find the tab labeled as “Compatibility”. Simply unchecked the box that says “Run this program in compatibility mode for”.

4.After having done that, apply the modified setting and reboot the system. In this way, appropriate syncing can be achieved and the error can be avoided.