ITunes won't start on my computer

Question

For some reason for the second time this year iTunes has stopped working on my computer. Every time I download it something goes wrong and I can no longer open it, I uninstall it with windows self extractor and reinstall and still nothing. How can I get my iTunes to start working again and how do I prevent future problems.

Answer 1

let's give it a try.
try uninstalling the ACE pack. then head into your Add/Remove and uninstall your existing QuickTime.
if Add/Remove won't let you remove QuickTime, download and install the Windows Installer CleanUp utility. then use it to clear any existing QuickTime installation configuration information from your PC:
Description of the Windows Installer CleanUp Utility
Next, we’ll manually remove leftover program files and folders.
1. On the Start menu, click My Computer (or double-click My Computer on the Desktop).
2. In My Computer, open Local Disk.
3. Open Program Files.
4. Right-click on the QuickTime folder and click Delete from the shortcut menu.
5. Navigate to C:\Windows\system32\.
6. Remove the files QuickTime.qts and QuicktimeVR.qtx.
7. Restart your computer.
next, we'll try to get a fresh copy of QuickTime into your PC by doing a repair install of itunes.
switch off antivirus and antispyware applications prior to the repair install.
go into Add/Remove and select itunes. click "Change" and then click "Repair".
if the repair install goes through okay, restart the PC and try launching itunes again. does it launch properly now?