Corrupted files draining battery life?

Genius Bar has identified several crashing/corrupted files within my phone that are causing my battery to draing drastically fast (1% about every 2 minutes). They reccommended me to completely reset my entire phone and start fresh. How can i do this and import ONLY my SMS threads back on? Is there a 3rd party software that allows you to not only SAVE your texts but import them BACK on the iPhone and still use them? Please Help!:(