If you frequently receive the following Stop Error messages in Windows 7 or Windows Server 2008 R2 : Stop 0x0000007E or Stop 0x00000050, then this hotfix from Microsoft may be able to help you.
On a computer that is running Windows 7 or Windows Server 2008 R2, you may receive one of the following Stop error messages:
Stop 0x0000007E (<parameter1>, <parameter2>, <parameter3>, <parameter 4>)
Stop 0x00000050 (<parameter1>, 0 or 1, <parameter 3>, 0)
This behavior occurs when you unload a USB video device or when you shutdown this computer.
Microsoft had released a Fix311840 to resolve this issue.