""During TXT install I got "QL40XX.SYS not found" and the install will terminated."" I had the same problem, same message, using XPproSP2. Couldn't figure it out. So instead of loading ALL the drivers (default mode) I just loaded the INTEL drivers (2 check boxes) I needed, using V5.3 Click on one of the green tabs, next to your OS, then check only the drivers you need, make sure the correct directory is shown at bottom left, and execute. Good Luck.