“Disable Hyper-V Features in LDPlayer to Restore Emulator Performance”

LDPlayer may show "Hyper-V is still enabled." If the prompt returns after you click **Fix** and restart, or a game shows "nRes ==0 fastpipeapi.cpp:640," Hyper-V is likely still affecting emulation. This guide uses a simplified script that t

Performance

By AndroidEmulator · Covers LDPlayer

Before You Start

Prerequisites: Read the list of features the script turns off, and accept the changes before you run it:; Windows Hello face and fingerprint recognition, and in some cases the PIN.; Windows Sandbox.; WSL2 (Windows Subsystem for Linux).; Hypervisor Platform.; Make sure you can verify your Microsoft account. You may need it after the changes.; Save your open work and close all programs. The PC restarts at the end.; Administrator access to Windows.

## Overview LDPlayer may show “Hyper-V is still enabled.” If the prompt returns after you click Fix and restart, or a game shows “nRes ==0 fastpipeapi.cpp:640,” Hyper-V is likely still affecting emulation. This guide uses a simplified script that turns off Hyper-V and related Windows features. Microsoft publishes its own script, which you can use instead.

## Why this works The script turns off Hyper-V and related Windows features. LDPlayer can then start without Hyper-V enabled, which is what the “Hyper-V is still enabled” prompt asks for.

## What to expect The script ends with the message in step 6. After the restart, LDPlayer should open without the Hyper-V prompt. The features listed in Before you begin stay off until you turn them on again.

## Common mistakes

Running the file without administrator rights.
Skipping the restart. The changes apply only after a restart.
Opening a game before you confirm that the prompt is gone.
Using a copy of the file from another site. Use the file from the link in this guide, and check that its name matches the note.

## When not to use this step If you rely on Windows Sandbox, WSL2, Windows Hello, or Hypervisor Platform, do not run this script. Ask LDPlayer support about other options first.

## Verify After the restart, open LDPlayer. The “Hyper-V is still enabled” prompt does not appear, and the game starts without the “nRes ==0” error.

## Notes

The download link uses the file name DisableHyperVRelatedFeatures.exe, but some instructions refer to HyperV-off.exe. Use the name of the file you downloaded.
If the script still fails, you can temporarily turn off Windows Defender Firewall under Control Panel > System & Security > Windows Defender Firewall > Turn Windows Defender Firewall on or off. Turn it back on afterward.
If you prefer Microsoft’s own script, follow Fix the nRes == 0 fastpipeapi.cpp:785/640 Error by Disabling VBS.
Turn your antivirus and firewall back on after you finish.

Security note: This guide can require turning off antivirus and, if needed, Windows Defender Firewall. It also turns off Windows Hello, Windows Sandbox, WSL2, and Hypervisor Platform. Risk: the PC has less protection while those controls are off, and features that depend on Hyper-V stop working. Revert: turn antivirus and the firewall back on, confirm that both show as active, and turn the Windows features back on from Turn Windows features on or off if you need them. Set up Windows Hello again if you use it.

## Troubleshooting

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