DO NOT DOWNLOAD THE NEW "OPTIONAL" UPDATE FOR YOUR NVIDIA DISPLAY DRIVER. IT MESSES UP YOUR SCREEN CALIBRATION. IF AND WHEN IT DOES, JUST UNINSTALL THE DRIVER AND REINSTALL IT USING RECOVERY MANAGER ON THE BOTTOM OF YOUR STARTUP PROGRAMS. That's enough caps-locking, I think. It's the latest update, made exactly yesterday and if your vista is set for automatic updates, this may happen. It was VERY annoying because after it installs, you can't recalibrate your touchscreen (not physically possible). But calling hp on their 24/7 support line gave prompt service, love hp support! Just a heads up for all those out there with the touchscreen.