Unexpected I/O error 0xc00000e9

I clean installed Windows 7 Professional (full version) 5 days ago and now my system cannot boot (it had been fine previous days with multiple shut down/ restarts). I attempted to start up today and got "Unexpected I/O error has occurred. Status 0xc00000e9" and some message about "Windows has encountered a problem communicating with a device connected to your computer" even though I had no USB devices connected at the time. Startup repair is not shown as an option; only continue or escape. When I continue, it shows the "Windows is loading" progress bar and it stops around 75% every time. Help!!

I do have the installation files available to reinstall the OS, but am hesitant to do that bcs I am afraid if I do I will lose all my current data..is that correct?? I really don't want to lose everything just to get the computer to work again.


Hi BeccaB,


The error message relates to a hardware error pertaining to your computer's BIOS. Basically it is telling you that the computer is not able to reliably communicate with the hard drive.


As you have no external device plugged in to your computer, there might be some drivers conflicting.  You might need to remove sound card etc.. from BIOS.


NOTE: Modifying BIOS/complementary metal oxide semiconductor (CMOS) settings incorrectly can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the configuring of BIOS/CMOS settings can be solved. Modifications of the settings are at your own risk.


If windows does not complete startup repair then it gives option to perform system restore. Restore the system to the date it was working fine. Below link will help you perform System restore: http://windows.microsoft.com/en-US/windows7/System-Restore-frequently-asked-questions


Samhrutha G S - Microsoft Support.

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Question Info

Last updated April 21, 2021 Views 306,788 Applies to: