The Process of Troubleshooting Startup
Startup problems can be divided into three distinct categories:
Problems that occur before the progress bar appears. These problems are typically caused by missing startup files (often as a result of installing a different operating system over Windows Vista), corrupted files, or hardware problems. For information about troubleshooting problems that occur after logon, read the next section, "Startup Troubleshooting Before the Progress Bar Appears."
Problems that occur after the progress bar appears but before the logon prompt is displayed. These problems are typically caused by faulty or misconfigured drivers and services. Hardware problems can also cause failure during this phase of startup. For information ...