• Phase 1: BIOS POST and Boostrap
  • Windows 9x Startup Menu Options
  • Previous version of MS-DOS
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    The Windows 9x Startup Process




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    The Windows 9x Startup Process

    • First loads in real mode; switches to protected mode

    • Io.sys is responsible for initial startup (real mode)

    • Control is turned over to Vmm32.vxd (protected mode) and Io.sys is terminated

    • Five-phase process





    F8 and F5 - Very A+

    Windows gives you some startup options. These can be useful in diagnosing symptoms and troubleshooting problems.



    Pressing F5 just before the message, "Starting Windows…" appears, boots you straight to Safe Mode.

    • Windows F5 safe mode

    • F8 brings up a BootMenu (Sometimes Ctrl for Windows98)

    Windows 9x
    Startup Menu Options

    • Normal

    • Logged (\BOOTLOG.TXT)

    • Safe Mode

    • Safe Mode with network support

    • Step-by-step confirmation

    • Command prompt only



    Problems (generic) - Very A+

    A General Protection Fault (GPF) is often caused by a program (application or driver) requesting memory used by another program or invading the Windows kernel memory space.

    Illegal Operation and Invalid Page Faults are caused by memory conflicts – both real and virtual.

    • A Fatal Exception 0E is a Page Fault interrupt and typically occurs when the operating system tries to access a virtual memory "page" and that "page" is missing or damaged. 




    • A Fatal Exception 0D is an error message that is most commonly found, but not limited to, outdated or damaged video display adapter drivers.



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