iTunes Has Stopped Working

My iTunes had been working fine and a few days ago it began giving me this error:

I am running Windows Vista Home Premium, Service Pack 2 on a Gateway DX4200-09, 64 bit operating system.

I have tried:

• Running it as Administrator
• Starting in Safe Mode
• Installing an older version
• Removing all components and installing a new version
• Removing an reinstalling QuickTime
• All of the steps listed here: Troubleshooting issues with iTunes for Windows updates

Please help! I've searched the web and the Apple support, but I can't seem to fix it.😢