Q: updating itunes 11.1.1

Hello there, Vikingfn.

The following Knowledge Base article should provide some pretty extensive steps for troubleshooting your issue:

"The feature you are trying to use is on a network resource that is unavailable" alert appears when removing Apple software in Windows

http://support.apple.com/kb/TS3704

If going through the instructions outlined there does not resolve your issue, you may just want to completely uninstall iTunes and then reinstall:

Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8

http://support.apple.com/kb/HT1923

Keep in mind that if you are running Windows XP there is an alternate link at the start of the document.

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro.