Hi all, I'm new here so hope I'm doing this right. I first became aware of MB through a Pc world columist I follow and decided to give it a try. I run an xp desktop and a vista premium laptop and use the same security programs on each. MB (version 1.34 installed and ran fine on the xp desktop and even caught a couple of items that my other programs had missed. However on the vista premium laptop after about an hour running in the full scan mode I get an error 28 out of stack space and vista shuts down Mb. It seems to run just fine in the quick scan mode however. I'm guessing I must have a conflict happening with some or one of my other security programs. For real time protection I'm running Threatfire, Spybot S&D,Avira basic Av,Windows Defender,Win Patrol and Spyware Blaster to block known dangerous websites. Im' guessing one or more of these may not be playing nice with MB in vista, so far the first one I temporarly shut off was threatfire but had the same problem. I know I can probably eventially find the conflicting one by disabling them all one by one which of course would be very time consuming but I was wondering if any of you have an idea of the likely program causing the conflict,Thanks Rich. P.S I'm thinking of seeing if I can get it to run a full scan in safe mode next,would apreciate your thoughts.