Q: my i tunes wont let me back up or update my iphone or ipad on my new hp laptop,but is working with a new ipod i have just bought

Hello, Joanabbey

Thank you for visiting Apple Support Communities. 

I would need more information on this issue to better assist you.  If you are receiving any errors or alerts and the steps below that I have include do not help, please reply back with this information and computer operating system. 

iOS: If you can't back up or restore from a backup in iTunes

http://support.apple.com/kb/ts2529

iOS: Troubleshooting USB-related alerts when syncing

http://support.apple.com/kb/TS5254

Resolve iOS update and restore errors in iTunes

http://support.apple.com/kb/ts1275

Cheers,

Jason H.