Win7 computer loses userenv.dll file and cannot boot

Win7 computer loses the userenv.dll file and cannot boot. Solution:

1. Press F8 to enter safe mode when booting, and copy the userenv.dll file to the local computer.

2. When turning on or restarting the computer, press and hold the F8 key for 1-3 seconds to enter the system advanced menu. In this interface, you can select "Use last known correct configuration" to enter the system.

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