I'll try this again.
I downloaded dbgl054.zip and put the contents of the zip in a folder called DosBox. When I run dbgl.bat I get the following error from DosBox:
'Unable to locate JRE meeting specification "1.5"
Sorry -- You don't seem to have the required version of the Java Runtime Environment [JRE] installed. DBGL requires at least JRE 1.5 to run.'
I downloaded and installed Java Runtime Environment 6.
I posted this problem here once but I seemed to have been abandoned.
Saying something about a 3rd party front-end. What ever that is.
If I can't get these old dos games to work I will most likely format the drive and revert back to Windows XP. Vista seems to be incompatable with much of my software.

James