I can't open iTunes. How can i fix this?

Whenever I try to open iTunes, my computer keeps bringing up and error window. It was working earlier but now it won't. I tried re-installing iTunes like 4 times and it still won't work. I don't know what to do because i just got the iPhone 5s and i need to back it up through my computer in order to restore my new one. My antivirus is expired to so i don't know if thats the problem but i need help!I can t open iTunes. How can i fix this

Desinatalalo y lo vuelves a instalar

If you just uninstalled the itunes program by itself, you won't help yourself. You have to uninstall All of the programs. You uninstall them in this order:

1. ITunes
2. Apple Software Update
3. Apple Mobile Device Support
4. Bonjour
5. Apple Application Support

Uninstall of the programs (in the correct order) then reinstall. If it doesn't fix, you are likely going to have to open up a troubleshooting ticket with Apple. If that is the case, here is the link

http://www.apple.com/...s/contact/

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