I updated my laptop and main PC with KUC, the pc has been fine. The laptop has randomly been self rebooting and on bootup says it recovered from a BSOD, its always done this when sitting idle with screen off. More interesting is after the first 3 BSOD, I disabled auto restart in system control panel, and then had another BSOD since which also auto rebooted, so didnt keep BSOD on screen. I have since stressed the cpu/ram tested ram for errors etc. and all is fine on stress and ram tests, bear in mind all BSOD's have happened at idle desktop. The BSOD error code is 124 and is ntoskrnl.exe note the laptop had not a single bsod prior to installing the hotfixes. thoughts?