What can I do to remove a prior DUI conviction from my record

MY DUI IS FOREVER HAUNTING ME!!: I received a DUI in Pennsylvania in August of 2005. It's rather complicated because there was an accident involved, therefore, I was not accepted into the ARD program. The accident happened due to the negligence of the state police - there was a miscommunication and the road was not shutdown properly. There was a vehicle parked perpendicular, blocking the only open lane (55MPH speed limit) on the road., no lights, street lights, etc. I hit the car at approx 35MPH. I was originally charged with a felony for aggravated assault by motor vehicle because the state trooper was injured. Because of the nature of the incident, the state police dropped the felony charges in exchange for a guilty DUI plea. I was a very successful executive in the transportation industry, and had been in the field for 11 yrs prior to the incident. Needless to say this destroyed my career. It's been 3 yrs and I'm trying to put this behind me and re-establish my career, but it continues to haunt me. I was in the military, had no previous record. I just want to move on with my life. Do you think there's hope for me being granted a pardon? - Is this your question? Add additional information