Why won't my iTunes update to 11.1.3?

I've been using iTunes on my macbook for a couple of years now and usually it updates fine, but I haven't updated it in a while. I need to update it to work with iOS7 on my iPhone and for some reason, it won't update? It tells me that 11.1.3 is available and then it searches for updates for a few minutes before telling me my internet connection isn't working when it obviously is and has been working fine. It also says that my Software Update Server isn't responding, I have no idea what this means.
I've tried doing it over and over again for the past week and it's starting to piss me off.

Reinstall iTunes.

1. First uninstall + reinstall itunes. The itunes info in the mac OS registry is probably corrupt and can't function properly.

2. Do a clean reinstall of itunes. It should solve the issue.

3. You can always get help from apple support. Get support for issues like the one u mentoned "software update server isn't responding"

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