Jack is getting the dreaded Windows Blue Screen of Death on boot up. Leo says it has to be a driver if it crashes on boot up. First, boot holding down the shift or F8 key and get into the boot screen. He should choose 'logged mode' so it will log what is happening. Then he should reboot into safe mode so he can read the boot log. The last line in the boot log will be the driver that is causing the crashes. He can then uninstall that driver, and download and install a new driver.