The error 3014 is a network error which can occur in iTunes application. To solve the problem, do the following steps::

Disable the Firewall
To solve Windows error 3014, disable the firewall software. If you are using Windows Firewall, perform the following steps
Delete Junk Registry Entries:
The obsolete and junk registry entries in your system registry can result in error 3014 in Windows 7, Vista and XP. Delete them in order to fix the problem.Download Registry Cleaner software.
Do a full registry scan and click “Repair” button.
Delete the Temporary Files to Make Free Disk Space:
A number of temporary files occupying a large number of disk space can result in Windows error 3014. To solve your problem, delete them immediately.
Stop Background Services:
Services running in the background can result in error 3014 in Windows 7, Vista and XP. Stop most of these services in order to avoid the problem in future.