I too have get the fleeting blue screen on start up followed by a restart. The only thing that I can read on the screen is vsdatant.sys. The rest isa blur. I have uninstalled and reinstalled ZL repeated over the past few months. It seems to start up for a week or so, just fine. Then it starts to crash upon start up. Sometimes it will crash repeatedly. The only permanent fix seems to be to start the program manually after the Windows goes through everything else.Does anyone have a permanent fix?ThanksSteve