COMODO ANTIVIRUS DOS PROGRAMS DONT WORK

Reading glasses to go’s freelance IT Guy loaded comodo antivirus at one of the locations. all the dos apps would not function even from the windows buttons they would not run. Running the app directly gave a strage message like unable to access unretriced space, or somthing similar. found in comodo there was a application security option which we disabled and it still dindt work. we added Retail8 as an exception didnt work. removed comodo worked like a champ. Just FYI