Just a shot in the dark but if you look at the Ultra Hal Assistant 6 folder, you should see a file: HalBrainEditor.exe with a file date of 2/4/2009 and a size showing 865 KB. (or very similar).
If you DO have this file try double clicking it and see if it runs and opens the Editor program.
If you do not see the above mentioned file, could be your download was corrupted.
Before deleting and downloading all over again, Deactivate Hal, then do a removal.
Then do a bug sweep / anti-virus check.
Do a Registry cleaner. A lot of times portions of Hal (as well as other programs) are left hanging about the registry.
You could manually go through and delete them if you knew what you were doing inside the registry. I would not suggest doing so without a good working knowledge of the registry.
After the above steps check out, reboot.
Download UltraHal once more an d do the install.
Look for the file with Windows Explorer, HalBrainEditor.exe.
Good luck!
PS = Make sure you don't have any weird permissions set that might prevent you from running the exe program?...just saying....