iTunes not responding when iPhone is connected on PC

For general advice see Troubleshooting issues with iTunes for Windows updates.

The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach.

Review the other boxes and the list of support documents further down the page in case one of them applies.

The further information area has direct links to the current and recent builds in case you have problems downloading, need to revert to an older version or want to try the iTunes for Windows (64-bit - for older video cards) release as a workaround for installation or performance issues, or compatibility with third party software.

Your library and device backups should be unaffected by these steps but there are links to backup and recovery advice should it be needed.

tt2

Installing an older version of iTunes won't delete anything in the library automatically, but in many cases an older version of iTunes won't open a library created by a newer version. If this computer had previously held an older version then you can restore a compatible library as described inEmpty/corrupt iTunes library after upgrade/crash, otherwise you can delete the current .itl file and let iTunes create a new one automatically and then import your media. If you've already made playlists then you can export these first and then import them afterwards.

tt2

If I recognized the symptoms and had a sure fire targeted solution I would have offered it. Since I don't, and you haven't specifically mentioned reinstalling iTunes I've suggested that as a starting point.

Have you performed a complete tear down & rebuild of iTunes as suggested at some point?

Which version of iTunes are you running now?

Have you tried rolling back to the most recent version of iTunes that didn't give you a problem?

If you have a 64-bit system have you tried the "for older video cards" version?

Have you tested the behaviour with a fresh library?

Have you tested the behaviour with a new user account, also using a fresh library?

Have you tried removing the existing backup set?

Have you tried Edit > Preferences > Devices > Reset Sync History?

For the last two I would first try backing the phone up to iCloud so you have a backup somewhere.

tt2

This is a user to user forum. While I quite agree that iTunes should install and work correctly on a new computer all I can offer are suggestions for resolving thing when it doesn't. In some cases removing and reinstalling iTunes resolves things. Disabling any anti-virus software and installing as an administrator may help. If the current version simply won't behave properly then the previous one might. As mentioned there is also a variant for 64-bit systems which, despite the title, may be useful even if your computer has the most up to date graphics card. It is a 64-bit installer for mostly 32-bit code similar to all 64-bit versions up to iTunes 12.1 and may prove more stable for some. I can only suggest you try tearing down the current installation and try the alternate or previous versions.

tt2