Wi-Fi, Bluetooth and Card readers were found to be common factors associated with this error. We recommend as a troubleshooting step disabling the drivers for Wi-Fi, Bluetooth, and Card readers, if they exist, to help resolve this issue.
Other known drivers that have been shown to cause this error:
· Drive-encryption software. Make sure your computer is not running any drive-encryption software and decrypt the drive before updating to Windows 8.1.
· Check for and uninstall any desktop utilities that may be running. Uninstalling IObit or Intel Desktop Utilities (including Extreme Tuning software but excluding Managed Engine) has been observed to resolve this issue
regards,