Try going to Start\Run type in msconfig and look under the startup menu. After uninstalling the programme, it may have left a start up item behind which would result in an error message. See if you can find anything relating to TrojanHunter and untick it.
Also, do a search of all files and folders and delete anything left over.
Regseeker is good for searching the registry for redundant entries. Go to "Find in the Registry" and type in TrojanHunter and delete everything it finds. Regseeker will automatically make a back up. click here