What NanoBrain said.
Also, check out your DB settings ::
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1. Start DarkEDIT.
2. Click Edit, followed by 'Edit Options' (the bottom one) on the menu that appears.
3. In the 'Options' dialog, hit the 'DarkBASIC Options' tab.
4. a) MAKE SURE that your 'DarkBASIC Program' field is set to c:\program files\dark basic software\dark basic\db.exe (or wherever you installed DB.)
4. b) Make sure the 'Command Line:' column has the default options in it - i.e., -c for compile, -x for execute, -b for make exe and -f for Build Final.
5. Hit OK, and try again...
If that doesn't work, make sure that your currently installed DarkBASIC compiler isn't s**ted.
Also, why the hell is DarkEDIT so freakin' messy?! ~DB and TMP files all over the place...
How's my typing? Phone 0800-GO-TO-HELL