How can we stop the person who is trying to get my girlfriend's ATV by suing me?

My girlfriend bought an ATV that every thing was motorized. Went to court house registered it and received the title in mail. 8 months later I'm riding it, some guy comes up claims it's his. I called the cops and he's told that my girlfriend is the owner. He claims that he's friends with an officer and he's getting the ATV. With the advice and influence of the officer, he sues me not my girlfriend who owns it, just me! I consult two attorneys I'm told he'll never get it cause he sued the wrong person and she is the registered owner. Well the judge orders me to give the ATV to this guy. My girlfriend who is not mentioned in the lawsuit refuses to give up the title! Judge calls me and tells me that if my girlfriend doesn't sign the title over to this guy I'm going to jail! I then call the state attorney generals office, I tell them the story and tell them the judge was high on something. It was obvious by the way he was acting in court. Sure enough the judge gets convicted of two drug felonies two DUI's and killed himself two weeks ago. The guy has the ATV we have the title it's been a year we checked and my girlfriend is still the registered owner. Question, being she was not a party to the suite can she now sue him for the ATV? After all, she is the legal registered owner and in the original order she wasn't ordered to do nothing. I don't know what to do please help! This is a six thousand dollar ATV.