save the file and close Notepad. Then double click on the file 'mapname.bat' to run it. Lot's of confusing stuff will show up in a command window as ZHLT compiles your map. When it is done you will see (at the bottom):

Press any key to continue . . .

Now do NOT press a key! First make sure nothing went wrong. Look in the folder where 'mapname.bat' is and if you see a new file called 'mapname.err' then your map FAILED to compile.
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I keep getting the file called 'mapname.err' the file says

hlvis: Error: Portal file 'mapname.prt' does not exist, cannot vis the map

What do i do??????