My iPod Touch isn't recognized in itunes.

My ipod touch isn't recognised in iTunes on the computer I always use to sync music onto it. (I can't see "Omar's iPod" in the left column.)

When I plug it in and I open up iTunes, the device isn't shown.

However, the device is shown in My Computer.

When I plug it into other computers, iTunes recognises my device. (I can see "Omar's iPod" in the left column.)

I've tried every method, except for Recovery Mode because I don't want to lose any of the files on my iPod.

I've done every method in the Apple trouble shooting manuals.

I need iTunes to recognise my device, help please.

- Omar