What should I do if I cannot enable sleep in windows 7 when the error 0xc000007f is reported?

Fault symptom:

After the system is upgraded, we will see that a "sleep" function is missing.

Enter "powercfg-h on" in the command to prompt "sleep failed, 0xc000007f error, this is a problem that cannot sleep"

Cause analysis:

The error 0xc000007f is reported because the system C disk is less than 8 GB:

Solution:

Dormant files can only be stored in system partitions, so we can ensure that the space on the system disk is large enough.