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This is a tech post, feel free to read on your own will.

It had been some time since I have my iTouch but this problem seems to be quite frequent and I would like to post it here on how I solve it, and hopefully to remind myself when I face this problem again.

Problem: You installed iTunes but when you double click on the application, an error message pops up and you can’t use your iTunes at all.

Overview of the problem: With my limited computer knowledge, I think it is something to do with the QuickTime player in the computer. Most probably you already have a QuickTime player which mess up with the iTunes, creating the error and problem.

Solve:
You might need these few programs before you start, I’ll explain why later. You are suppose to have “Windows Install Clean Up”, “Unlocker” and the latest version of iTunes.

Before you start doing anything, scan through your list of programs that you have in your computer to determine whether there is any program associated with QuickTime. For me, the main culprit is the K-Lite Mega Codec Pack (QuickTime is one of the many application and codec included in this mega pack).

So, you should proceed by uninstalling the application which is associated with QuickTime, in my case - K-Lite Mega Codec Pack.

Later on

1. Download  “Windows Install Clean Up” and run it. Delete the QuickTime program from the list.
2. Go to C:ProgramFilesQuickTime and delete all the whole folder. If you are running QuickTime associated program in the background, an error message will pop up saying that it is impossible to delete the program. Install “Unlocker” and try again. This time, a window will pops up and prompt you to delete that file, if it is still unable to do so, click ‘delete file in the next reboot’. Reboot your PC.
3. Go to C:WindowsSystem32 and look for QuickTime files by pressing “Q”. Delete all the files which have the quicktime name on it.
4. Reboot, and now install a fresh copy of iTunes.

If you follow the steps properly, you shouldn’t have any problem running the program now. Reinstall the K-Lite Mega Codec Pack and uncheck the Quicktime sections when you are going through with the process.

That’s all. Good Luck!

iTunes :)