NtFreezeRegistry - NtDoc

#ifndef _NTREGAPI_H
#if (PHNT_VERSION >= PHNT_VISTA)

/**
 * Freezes the registry and prevents changes from being flushed to disk.
 * 
 * @param TimeOutInSeconds Timeout in seconds.
 * @return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtFreezeRegistry(
    _In_ ULONG TimeOutInSeconds
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwFreezeRegistry(
    _In_ ULONG TimeOutInSeconds
    );

#endif
View code on GitHub