Are you getting that from both your exofire.net and smartMMO.com urls?
It's most likely that AVG detected a malicious site at another exofire.net account. That account is most likely gone now because x10hosting admin and server security scripts usually find malicious accounts pretty quickly. But programs like AVG put out a domain wide alert for malicious sites, so all exofire.net sites are probably going to have this alert until AVG is convinced that the threat is cleared out. I don't think your site has anything to worry about.