To isolate problems using Selective Startup options
You must be logged on as an administrator or a member of the Administrators group in order to complete this procedure. If your computer is connected to a network, network policy settings may also prevent you from completing this procedure.
On the General tab, click Selective Startup, and then clear all of the subsequent check boxes. You will not be able to clear the Use Original BOOT.INI check box.
Starting with the first available check box (Process SYSTEM.INI File), select each check box one at a time, and restart the computer as prompted until the problem is reproduced.
Once the problem reappears, click the tab that corresponds to the selected file. For example, if the problem reappears after selecting the Win.ini file, click the WIN.INI tab in System Configuration Utility.
You may want to print this Help topic before restarting your computer, because you will not be able to open Help during startup.
Begin troubleshooting by selecting the first check box under Selective Startup, and then restart the computer as prompted.