Fix Stop 0x9F Error On Windows Vista and Windows XP

Stop 0x9F Error On Windows Vista

The following Stop 0x9F error message may be displayed on your Windows Vista computer when your system wakes up from sleep mode:

"STOP 0x0000009F (parameter1, parameter2, parameter3, parameter4) DRIVER_POWER_STATE_FAILURE"

Cause of the Error

This error message is usually displayed if a device using Institute of Electrical and Electronics Engineering (IEEE) 1394 connection is attached to your Windows Vista PC. Some of the examples of such devices are an Apple iPod and Maxtor One Touch II 300 GB model external hard disk.

Resolution Method

You can resolve this problem by installing the 929762 update on your system. To download the update package for Windows Vista 64-bit computer, click here.

You can also resolve the issue by downloading and installing the latest Windows Vista Service Pack on the PC. You can obtain information about the latest service pack from the Windows Update website.

Stop 0x9F Error On Windows XP

You may receive the following Stop 0x9F error message on your Windows XP computer:


Cause of the Error

This error message is displayed on your Windows XP PC, when one or more drivers installed on your system are unable to handle power state transition requests when the system is:

  • shutting down.
  • going in to Standby mode or resuming from it.
  • going in to Hibernate mode or resuming from it.


To resolve this issue, you need to find out the offending device or file system filter driver and repair or remove it from the system. You can do this by performing the following steps:

  1. Open the Windows XP Hardware Compatibility List (HCL) and ensure that all hardware on your system is on this list.
  2. Use the Sigverif.exe tool to identify unsigned device drivers installed on your Windows XP computer. To use the tool, perform the following steps:
    1. Open Start menu, select Run, type Sigverif and then click OK.
    2. Click the Advanced button.
    3. On the Search tab, select the Look for other files that are not digitally signed option.
    4. Type C:\Windows\system32\drivers in the Look in this folder box, and then click OK.
    5. Click the Start button.
    6. If you find any unsigned drivers, disable them by:
      • Using Device Manager.
      • Uninstalling the software that installed the driver on your computer using Add or Remove Programs or by using a third-party program uninstaller, such as Perfect Uninstaller.
      • Access Winnt\System32\Drivers and renaming the files of the driver causing the problem.
  3. Update the drivers installed on your system.
  4. Update the files of software programs, such as remote control, antivirus, and backup software that use filter drivers.
  5. Disconnect and uninstall any non-essential devices from the system to isolate the problem.
  6. Reinstall Windows in a new folder on the hard disk and then add drivers one by one to try and locate the faulty driver.

To prevent stop errors, such as the Stop 0x9F error, it is essential that you keep your computer and device drivers updated with the latest releases. You must also take care not to install incompatible software, hardware, and drivers on the system.