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"Error loading operating system" after reboot with Windows XP Pro SR3

Discussion in 'Windows XP' started by g61, Oct 1, 2008.

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  1. g61

    g61 Thread Starter

    Oct 1, 2008
    So here is my problem: Occasionally, after reboot I get "Error loading operating system". After that the only thing I can do is shut down the computer and fix the windows MBR/Boot Sector (see bellow…).

    I'm running a clean install of Windows XP Pro SR3 on a Lenovo T61 laptop. I have confirmed that in the majority of times the problem with the MBR/Boot Sector happens during the windows session and not necessarily upon reboot. When it happens there are no symptoms in windows except for when I try to run chkdsk, I get the following error:

    "The type of the filesystem is RAW.
    CHKDSK is not available for RAW drives."

    I've had my T61 for 6 months now and I've had this problem about 15 times so far. Obviously this makes my T61 unstable and is becoming a major problem (I like to shut down the computer before taking it anywhere, and I don't really use Hibernate).

    Solving this problem is very easy and takes 3 minutes… But the Win XP CD is needed for the fix and I don't want to carry it around with me everywhere. And anyway, it's annoying and makes my T61 crippled…

    To fix the problem:
    1 Change AHCI -> Compatibility in BIOS.
    2 Boot using the Windows XP CD.
    3 Enter the Recovery Console (press R).
    4 "fixboot"
    5 "fixmbr"
    6 Restart ("exit").
    7 Change back to AHCI in Bios.

    After that the computer works perfect until the next time… Things I have tried so far:
    1 Installed latest Bios for T61.
    2 Checked firmware for HD (WD Scorpio WD1600BEVS) and it's the latest.
    3 Installed all windows updates for Windows XP and all Lenovo specific updates.
    4 Installed all latest drivers for T61.
    5 Checked computer for Viruses, malware, etc. with 6 different scanners - it's clean.
    6 Updated some of the programs that I thought might be causing problems: Avira , PerfectDisk 2008, TrueImage Home, etc. (I am not running any special esoteric software, only big label popular stuff).
    7 Checked HD with PC Doctor, WD's Data Lifeguard Diagnostic Tool and CHKDSK - there are no problems.
    8 Made sure EnableBigLba in the registry is enabled (although it should not affect SATA drives anyway).
    9 Disabled Lenovo's "Active Protection System" - the problem persists.
    10 Checked MBR/Boot Sector with TestDisk analysis - there are no problems.

    I am out of ideas. Something is corrupting the MBR/Boot Sector occasionally during the windows session or upon shutdown. But I can't find why or under what circumstances it happens… The only thing I didn't try was a completely new clean system install, a thing which I REALLY don't want to do. Except for this problem the system is great, very stable and I'm very happy with it.

    Any ideas? Thanks in advance.
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