What recovery model is your database using? are you taking regular log backups? If your in full recovery & not taking log backups, then this may explain why Navision4_Log3 is so large. You should fix this by either taking log backups, or switch to simple recovery.
I would move Navision4_Log to the G drive rather then try to remove it. My guess is that Navision4_Log3 exists because the server was running out of space on C: & the admin didn't know how to move it.
To move the log file to G: use the following:
ALTER DATABASE Navision4 SET OFFLINE;
--move log file to G:
ALTER DATABASE Navision4
MODIFY FILE (
ALTER DATABASE Navision4 SET ONLINE;
EDIT:SQL Server 2000 doesn't support those options, so you'll have to use sp_detachdb & sp_attachdb, you can also detach & attach in the Enterprise Manager GUI. Just make sure you attach the db & specify the owner as sa.
Then you can remove Navision4_Log3 if you wish. What you'll need to do (if your in full recovery) is take a log backup, then shrink the log using
DBCC SHRINKFILE('Navision4_Log3', EMPTYFILE)
You may need to take several backups & do several shrinks before the file will empty out & then you should be able to remove it.