John, thank you very much for your replay. Pls note the following: 1) Since disabling MalwareBytes on my laptop, the BSoD did not reappear. So I take it that Malwarebytes is the culprit (a member in an Israeli forum suggested that I should remove Malwarebytes, so it is a well known problem). 2) I’m using a 802.11n USB Wireless LAN Card. It is: Alfa AWUS036NH. It is so sensitive and powerful, that if I have to choose between using MalwareBytes or using that LAN Card, I will give up on MalwareBytes. 3) I have disabled Intel® Centrino® Wireless-N 2230, since I’m using the Alfa LAN Card. 4) Ralink is the driver for the Alfa LAN Card. Thanks and best regards.