To change the text try this:

CWnd* pWndButton = GetDlgItem( ID_WIZBACK );
pWndButton->SetWindowText("No");
pWndButton = GetDlgItem( ID_WIZNEXT );
pWndButton->SetWindowText("Yes");




To hide Help button do this:

CWnd* pWndButton = GetDlgItem( IDHELP );
pWndButton->ShowWindow( SW_HIDE );





Let me know if this help u
Regards,
Ovidiu