Finally I found and installed the correct VGA- Driver ( after installing ca. 147 times the wrong ones) ; - ) ) ) Have Atheros Wlan adapter instead Intel, but no problem, found this special driver.
Jun 10, · Free download and instructions for installing the NVIDIA GeForce 8400 GS Video Card Driver for Windows XP, Windows XP 64- bit, Windows Serverbit, Windows Vista, Windows 7, Windows 8, Windows Vista 64- bit, Windows 7 64- bit, Windows 8 64- bit. Most likely you have the Intel- Driver 945G Graphics Controller assuming you don' t have a dedicated video card.