When trying to launch the iTunes, you may get this error message: “iTunes was not installed properly please-install iTunes; Error 7 (windows error 999)”. Some have done as what the error message suggested to uninstall & reinstall the iTunes for several times, but with no success. What the hell causes this iTunes error and how to fix them correctly on the computer?

Just as what I have said, the iTunes error may be caused when there is something wrong with the one installed on your PC. Just uninstall it as promoted and then reinstall it again. Most of the time, this solves the error, but if the error remains, continue on reading and you will get solutions.
If possible, you should uninstall remove the QuickTime, and other software components associated to Apple from your computer. These items may not work correctly with the iTunes on your PC to cause the iTunes error 999. So, you should remove all these related programs and run the Windows built-in Disk Cleanup utility to delete all these files immediately from your computer.
Thirdly, you should check the NET.framework. Error 1053 normally occurs when you start, stop or pause a Windows service. The computer will freeze for a few moments until the iTunes error 999 message appears. Learn how to fix this error in a few easy steps.
*Download Microsoft .NET Framework 1.1 Service Pack 1. You will be asked if you want to save the file to the computer. Select “Save File.” The service pack will now be downloaded onto the computer.
*Open the downloaded icon (it will be on the desktop or in a Downloads window).
*Follow the steps to complete the installation. Once the updated service pack is installed you should no longer see the Error 999 in iTunes appears when you try to start, stop or pause a Windows service.
If the above steps do not help, it is very easy to determine that the problem relies on the computer itself, that is, there must be something wrong with the Windows registry. We know that Windows registry is the place to store all vital settings and options of the operating system to ensure the proper running of the computer and all programs installed on the PC. No matter whenever you start the computer or launch a specific program, it will read through the registry database for its required files and processes. If it fails, there is no doubt that you will get kinds of computer errors just like iTunes error 999 when its related entries have been corrupt and the iTunes cannot be launched correctly. So, the last chance that you should do when trying to solve this player error is to run a good registry cleaner to troubleshoot and fix all errors insides registry. With a compact and error-free registry database, I can promise that you will always enjoy a pleasant computer life.
So, if you are running Windows 7 and troubled with the iTunes error 999 right now, take the above solutions one by one. Then, you can both run your iTunes & the computer correctly all the time without errors.
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My iTunes won’t work on my computer it says windows error 7 iTunes error 999 I’ve think ive tried everything, but I forgot to fix the registry errrors. Will follow your solutions here to go now!
my itunes won’t come it will rather say ” iTunes was not installed correctly. e reinstall iTunes. Error 7 (Window error 999)”. i can’t live without music and i want new music on my iPod. Did as what you said here and now my computer and iTunes runs without problems.