If you have not cleaned the RUN entries for a while or you choose not to, you would have a list of them.If you want to selectively delete the entries do this.Open registry by going to START-RUN and entering regedit. Navigate to [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RunMRU] . In this look for various entries on right pane. You can choose what you want to delete and simply delete it. Or you can clear all command lines as well.