Yup, reloading the OS is the best option, and don't worry, its quite easy to do if you follow the instructions in the link I provided. As to restoring your data, that's super easy to do. Once the OS reload is complete, simply open the Desktop Software, go to Device > Restore and restore your data. It will take a couple of minutes, but once you're done, your messages, address book and everything else will be there. Your pictures aren't deleted in the OS reload as they're stored in a separate memory area, so you don't need to worry about that.
Good luck and if you have any questions, don't hesitate to ask.
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