The new 40.41 Detonators' Control Panel doesn't work if you had installed a localized older Detonator before. To solve the problem, simply delete the 2 obsolete Files nvrsXX.dll and nvcpXX.hlp in your windowssystem32 folder , where XX is your language code. Additionally the file nvqtwk.dll from older drivers isn't needed anymore so you should also delete it to be sure.