If you’re experiencing problems with your system, you can use the System Configuration tool from Administrator Tools to help you troubleshoot and configure your computer. To help you troubleshoot your system, you can select an option to start Windows Vista with a minimal set of resources, which can help you successfully boot and narrow down the problem. After you reboot successfully, you can start to select services and startup items to add them into the equation and determine what works and what doesn’t. If you need to launch an administrator tool during the process, you can do it from the Tools tab.
Change System Configuration Options
Click the Start button, and then click Control Panel.
Double-click the Administrative Tools icon in Classic view.
Double-click the System Configuration icon.
Click the General tab.
To change the way Windows starts up, click the option you want: Normal, Diagnostic, or Selective.