Iphone 4 not being detected?

My iphone 4 was working fine but now my laptop won't detected it in my computer or itunes. I have ios 7.0.3 and the latest itunes which i have uninstalled and reinstalled for times aswell as deleted everything to do with apple. I have tried updating windows but that fails everytime so any help would be great because i need to backup my phone

Have you tried a different cable?
happened to me and i had to change the cable…

hope it helps

Have you tried looking for it in Explorer as a removable disc drive?

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