Fix Stop Error 0x9F While You Hibernate Or Restart Windows 7 PC
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Do you have a Windows 7 PC with fingerprint biometric device attached to it? Then you might face a Stop error 0x9F. This error is due to installed application that uses the Windows Biometric Framework (WBF) to access the device. According to Microsoft KB975599, the problem occurs due to requests on the pipe to the device are not cleaned up or canceled.
Microsoft has released a hotfix for this problem. Download and install it if you face this problem.