RemoveDirectory does not work

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C++

I have written the following method to remove a directory including any files that it contains. The files get deleted fine, but it always fails to delete the directories. I have deleted the directories successfully from a command prompt, but using the code below, or a call to system() with the same command used at the command prompt, the directories are not deleted.
As you can see, I ensure I set the current directory to something other than the one I am deleting (which is on my H drive).

bool Workspace::DeleteDirectory(CString directoryPath)
{
    CFileFind finder;
    // build a search string with wildcards
    CString searchString(directoryPath);
    searchString += _T("\\*.*");
    // start searching for files
    BOOL bSearching = finder.FindFile(searchString);
    while (bSearching)
    {
        bSearching = finder.FindNextFile();
        //skip . and .. files, as they represent thecurrent directory and parent directory
		//markers while iterating through files. Otherwise an infinte loop would occur.
        if (finder.IsDots())
		{
            continue;
		}
        // if it's a directory, recursively delete the files
        if (finder.IsDirectory())
        {
            CString directoryPath = finder.GetFilePath();//condense
            DeleteDirectory(directoryPath);
        }
		else
		{
			//delete the file
			//CT2A converts CString to const char*
			if(remove(CT2A(finder.GetFilePath())))
			{
				//0 is success so file removal has failed
				AfxMessageBox(_T("File: ") + finder.GetFilePath() + _T(" could not be removed"));
				finder.Close();
				return false;
			}
		}
    }
	//not searching anymore as all files have been deleted, so delete the directory
	SetCurrentDirectory(_T("C:\\"));
	
	if(!RemoveDirectory(directoryPath))
	{
		AfxMessageBox(_T("Directory: ") + directoryPath + _T(" could not be removed"));
		finder.Close();
		return false;
	}
	else
	{
		finder.Close();
		return true;
	}
}

I'll be very grateful for any help.