You are not the only one, others have reported the issue as well. If you are running Windows 7 or above you should be able to download iTunes 12.3.3, the latest version.
Some have had to delete the Apple Mobile Device driver (it re-installs on the next pc boot and device connection). Some have had to disable their antivirus, particularly McAfee as is known to create issues with iTunes. For the driver see the article below. While the article refers to W10, the W7 process is nearly identical. Please note that this forum is having issues with links today. If unable to open directly from below, paste the link to a browser and open it there.
http://www.technipages.com/itunes-fix-iphone-or-ipod-not-detected-in-windows