Can I own a gun in TX if I've been arrested back in '09, and have been charged for Assault Family violation (ex-gf)?

I'm looking for an attorney who can do a non-disclosure for my case. I've been arrested back in 2009, and have been charged for Assault Family violation. Later on, my previous attorney downgraded a charge to normal assault. I've completed community service and all probations in 2010. I pled no contest and the case is now dismissed. I didn't know about the record would stay with me and make me a hard time to find work. (I knew from the employer that I applied work to that I should find lawyer help me remove this record. The plaintiff was my girlfriend (back then) now she's my lovely wife. I just need to get this thing out of my life so I can start fresh and be able to find work. Thank you for your help.