My iPhone 4 isn't being recognised by my laptop

My iPhone 4 is about 2 years old and to transfer it from one network to another I need to back it up on iTunes and then clear and restore it. However my iPhone just isn't being recognised by my laptop, as in, when I plug it in it won't charge and my laptop doesn't offer any options - like download photos. It does make the sound that something has been inserted in though. It was recognised however on my brother's laptop, if that helps? I know it's not the USB port because I have a USB mouse - and that works in both ports. My laptop has had some issues this week - on Wednesday it wouldn't start up properly but *hopefully* those issues are gone. We used Norton Utilities and at first it said my registry health was poor, but by Friday it was high. Another thing - my laptop didn't shut down after plugging my iPhone in yesterday, it just stayed at the spinning 'Shutting Down' icon all night. Do you have any advice?

Restart the laptop and phone.

Try again.

If that dosnt work click start, search for services, click allow.

In services find apple mobile device and open it up. Click stop then start it again.

In the same list find ipod service. And follow the same.

Log off then log back on, try iTunes again with your iphone.

If it still dosnt work, uninstall iTunes and reinstall.

Hope this helps

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