I was having lots of Access Violations on my Acer laptop when I first installed Band-in-a-Box 2011 build 312. Just after that I went on vacation with the laptop and did not have Internet for a week, so I learned to live with the errors. I realized I was getting the access violations when I changed settings or changed songs without first stopping the song from playing, so I just got in the habit of stopping the song before making changes. When I got back from vacation I got caught up on my Windows updates and installed BB 2011 build 313. I don't know which update fixed it, but I stopped getting the errors. I don't use that laptop any more, but I went back to it today to try to get it to cause an access violation, so that I could try to trouble-shoot your issue. No luck -- I could not get it to cause the error that was so common when I first installed BB 2011.

Soon after installing BB 2011 I realized I needed more computing power, so like you, I bought a new Toshiba laptop. I left all of the securtiy features in place and have not had any problems.

In trouble-shooting, I would only make one change at a time. If that change does not solve the problem, you might want to change the setting back. I read Kent's post saying User Account Control causes most Access Violations, but I am a sceptic, and you already showed that was not the problem. UAC is the feature that pops up saying are you sure you want this progrom to make a change to your computer. I am going to keep that as long as it is not causing a problem. Where I would suspect to find the problem is with the sound drivers or DirectX.