Microsoft is helping Windows 7 Service Pack 1 customers affected by stop error 0x0000007F when copying a file over a network to resolve the issue. According to Microsoft the glitch affects computers running Windows 7 Service Pack 1 or Windows Server 2008 R2 SP1.
This happens to users that “configure the computer to automatically connect to a wireless network. Then, [customers] restart the computer or resume the computer from sleep mode or from hibernation,” Microsoft said. “[Users] start data transfer with another computer through a wired or wireless network connection.”,” explained Microsoft in K2519736.
In this scenario, you may receive an error message that resembles the following under rare circumstances:
STOP: 0x0000007F (parameter1, parameter2, parameter3, parameter4) UNEXPECTED_KERNEL_MODE_TRAP
Microsoft says this may also occur on a computer that is running Windows 7 or Windows Server 2008 R2 and that has hotfix 979612 installed. For more information, click the following article number to view the article in the Microsoft Knowledge Base: KB979612 – A hotfix is available that improves TCP loopback latency and UDP latency in Windows Server 2008, Windows Server 2008 R2, Windows Vista, and Windows 7.
A supported hotfix is available to fix the problem mentioned above.