These three messages frequently appear together in VMware, VirtualBox, and certain Rust runtime environments, and each one points to a distinct but connected problem.
This guide covers every verified fix for the reflex-rs blocked deletion and hypervisor loaded error, walking you through solutions that address all three components cleanly.
What Causes Reflex-RS, Blocked Deletion of Token File, and Is the Hypervisor Loaded Error
These errors rarely occur in isolation. Understanding what each message means helps you apply the right fix efficiently.
- Reflex-RS error: Indicates a Rust-based hypervisor component or watchdog process failed to initialize or communicate with the kernel driver
- Blocked deletion of token file: The system or a security tool is preventing the VM software from deleting a temporary lock or authentication token, usually due to permission conflicts or antivirus interference
- Is the Hypervisor loaded: The software is querying whether the hypervisor kernel module is active and receiving no valid response, meaning the driver either failed to load or was blocked
Common system-level triggers include:
- Hyper-V or Windows Hypervisor Platform conflicting with the VM driver stack
- Insufficient file system permissions on the token file directory
- Antivirus or ransomware protection locking temp files
- Memory Integrity blocking reflex-rs kernel communication
- Secure Boot preventing driver signature validation
- Corrupted VM software installation or leftover lock files from a previous session
- Running the application without administrator privileges
How to Fix Reflex-RS, Blocked Deletion of Token File, and Is the Hypervisor Loaded
Fix 1: Run the Application as Administrator
File permission errors and token file deletion failures are almost always caused by insufficient privileges. Therefore, this is the first and fastest fix to attempt.
Steps:
- Fully close your VM software or Rust application from Task Manager
- Right-click the application executable or desktop shortcut
- Select Run as Administrator from the context menu
- Click Yes when prompted by User Account Control
- Allow the application to launch fully and check whether all three error messages are gone
Fix 2: Manually Delete the Leftover Token File
When a previous session crashes or exits improperly, the token file is not deleted cleanly. As a result, the next launch finds a stale lock file it cannot remove, producing the blocked deletion of token file error.
Steps:
- Open File Explorer and navigate to the temp directory by pressing Win + R and typing %temp%
- Search for files containing the name of your VM software or reflex in the filename
- Also check these locations for leftover token or lock files: C:\ProgramData\VMware C:\Users[YourUsername]\AppData\Local\Temp
- Select any .lock, .token, or .pid files related to the application
- Delete them manually, then empty the Recycle Bin
- Restart your PC and relaunch the application
Fix 3: Disable Hyper-V and Set Hypervisor Launch Type to Off
The “Is the Hypervisor loaded” query fails when Windows has already claimed the virtualization layer through Hyper-V. Consequently, the reflex-rs component receives no valid hypervisor response and throws an error.
Steps:
- Open Command Prompt as Administrator
- Run the following command: bcdedit /set hypervisorlaunchtype off
- Next, press Win + R, type optionalfeatures, and press Enter
- Uncheck Hyper-V, Windows Hypervisor Platform, and Virtual Machine Platform
- Click OK and allow Windows to apply the changes
- Restart your PC before relaunching the application
Fix 4: Disable Memory Integrity and VBS
Memory Integrity and Virtualization Based Security block kernel-level driver communication. Since reflex-rs operates at the kernel boundary, these features directly interfere with its token management and hypervisor query functions.
Steps:
- Press Win + I and navigate to Privacy and Security, then Windows Security
- Select Device Security and click Core Isolation Details
- Toggle Memory Integrity to Off
- Press Win + R, type gpedit.msc, and navigate to Computer Configuration, then Administrative Templates, then System, then Device Guard
- Set Turn On Virtualization Based Security to Disabled
- Restart your PC after applying both changes
Fix 5: Add Folder Permission to the Token File Directory
Sometimes the token file directory itself has restrictive permissions that prevent the application from writing or deleting files, even when running as administrator. Correcting the folder permissions resolves this directly.
Steps:
- Navigate to the folder where the token file is stored, typically: C:\ProgramData\VMware or C:\Users[YourUsername]\AppData\Local\Temp
- Right-click the folder and select Properties, then go to the Security tab
- Click Edit, then select your user account from the list
- Check Full Control under the Allow column
- Click Apply, then OK to save the permission change
- Relaunch your application and check whether the blocked deletion error is resolved
Fix 6: Disable Controlled Folder Access and Ransomware Protection
Windows Controlled Folder Access, part of Windows Defender’s ransomware protection, frequently blocks applications from writing to or deleting files in protected directories. This is a common hidden cause of the blocked deletion of token file error.
Steps:
- Press Win + I and go to Privacy and Security, then Windows Security
- Select Virus and Threat Protection, then scroll to Ransomware Protection
- Click Manage Ransomware Protection and toggle Controlled Folder Access to Off
- Alternatively, click Allow an App Through Controlled Folder Access
- Add your VM software executable as an allowed application
- Restart Windows and relaunch your application
Fix 7: Disable Secure Boot to Allow Driver Loading
Secure Boot prevents unsigned kernel drivers from loading, which causes the “Is the Hypervisor loaded” check to fail because the reflex-rs driver never initializes in the first place.
Steps:
- Restart your PC and enter BIOS/UEFI using F2, Delete, F10, or F12 depending on your system
- Navigate to the Security or Boot tab
- Locate the Secure Boot setting and set it to Disabled
- Save your changes and exit BIOS
- Allow Windows to boot fully, then relaunch your VM software or Rust application
Fix 8: Repair or Reinstall the VM Software Cleanly
Corrupted installation files are a frequent cause of reflex-rs initialization failures. A damaged reflex-rs component cannot manage token files correctly or communicate with the hypervisor layer, producing all three error messages at once.
Steps:
- Open Settings, go to Apps, and locate your VM software
- Select Modify or Repair if available and complete the repair process
- If no repair option exists, uninstall the software fully
- Navigate to C:\ProgramData and C:\Program Files and delete any remaining folders related to the application
- Also clear leftover entries from %appdata% and %localappdata%
- Restart your PC, then perform a fresh installation using the latest version
- Launch the application as administrator after reinstalling
Fix 9: Check and Fix Windows Subsystem Integrity Using SFC and DISM
Corrupted Windows system files can interfere with driver loading, file permission enforcement, and hypervisor state queries. Running built-in repair tools addresses all of these at the OS level.
Steps:
- Open Command Prompt as Administrator
- Run the System File Checker first: sfc /scannow
- Wait for the scan to complete fully before proceeding
- Then run the DISM repair command: DISM /Online /Cleanup-Image /RestoreHealth
- Allow DISM to finish, which may take several minutes depending on your system
- Restart your PC after both tools have completed and retest your application
Conclusion
The reflex-rs, blocked deletion of token file, and “Is the Hypervisor loaded” errors form a connected chain of initialization failures rooted in driver conflicts, file permission restrictions, and Windows security feature interference. Every fix in this guide targets a specific link in that chain, from clearing stale token files and adjusting folder permissions to disabling Hyper-V and repairing system integrity. Start with Fix 1 and Fix 2 for the quickest wins, then work through the remaining solutions if the errors persist. With the right configuration in place, your virtualization environment will initialize cleanly without these errors appearing again.
