I know this is an old subject, but I'm posting what worked for me for those still using version 8. I had the exact same problem and I had to edit a registry setting to get it to work. For the record, I'm using Windows 7.
First, make sure Dreamweaver isn't running.
In the registry editor, navigate to the following location:
HKEY_CURRENT_USER\Software\Macromedia\Dreamweaver 8\FloaterStates\Toolbars3\Settings1
Look for the string values starting with ToolbarID. Find the one that has a data value of "Standard_Toolbar" and note what the array number is on the string value name (i.e. ToolbarID0 where 0 is the array number.) Mine was 0. Now find the DWord value starting with Visibilityn where n is the array number. For my values, this was Visibility0. Set its data value to 1.
Now start Dreamweaver and open a file so it shows in the editor. See if the toolbar is showing now. Note that the option to show the toolbar will still be grayed out, but it will actually show. If it still doesn't show (like in my instance), close out Dreamweaver and re-open. If not showing still, close the app and repeat the procedure of editing the Visibility DWord by setting it to 0, saving it, and resetting it back to 1. Refresh the registry using F5, then reopen Dreamweaver. Hope this works for you.
Thanks,
Micheal