Hallo Bashrat, Firstly, i would like to say that your driver packs are the most usefull things i have found on the internet in years. This is a trully revolutionary concept! i have seen the portcls.sys error on quite some machines now. AC97 chipsets are apparently extremely popular. Looking at the topics involving this error, i was able to add drivers to the driver pack sound and solved this error by doing that. If i understand correctly, the real problem is that, if there is no driver available for a AC97 (soundmax) compatible soundcard, the installation will crash with a blue screen showing the portcls.sys error. This is very disturbing for the installation, because if you want the installation to proceed without going through the hassle of finding the correct sounddrivers, updating the driverpack, then updating the unattended installation, burning the cd, etc, the most efficient way to go is simply doing the same installation again, but then with an unattended cd which does not include the driverpack. In practice, what it comes down to is that i have give out 2 cd's to make certain that the installation will finish properly. For these reasons i would be very interested in some method to prevent this blue screen error. If there really is no solution for this, i would be very interested in a new driver pack sound which is updated as much as possible, so this error is avoided as much as possible. Are you planning on releasing a new sound driver pack any time soon? Ruud