Q: when I backup my ipad to Itunes on PC and I click the apps button, Itunes crashes

Hello meteddy,

Thank you for using Apple Support Communities.

I would start by restarting the iPhone and the computer, and then try to access the Apps tab again.

iOS: Turning off and on (restarting) and resetting

http://support.apple.com/kb/ht1430

Depending on the version of Windows you are using I would recommend either of these 2 articles.

iTunes for Windows Vista or Windows 7: Troubleshooting unexpected quits, freezes, or launch issues

http://support.apple.com/kb/ts1717

Or

iTunes for Windows XP: Troubleshooting unexpected quits, freezes, or launch issues

http://support.apple.com/kb/TS1421?viewlocale=en_US&locale=en_US

If the issue persists after that, then I would re create the iTunes library.

iTunes: How to re-create your iTunes library and playlists

http://support.apple.com/kb/HT1451

Take care,

Sterling