VMware Won't Start on Windows: Causes and Fixes

Why VMware Won't Start on Windows?

The error "VMware won't start" is a common issue encountered by users of VMware Workstation, VMware Player, or other VMware products on Windows. Symptoms can vary: the program may not open at all, crash when attempting to start a virtual machine, or display error messages such as "VMware Workstation cannot connect to the virtual machine" or "The VMware Authorization Service is not running". This problem is usually related to Windows services, drivers, software conflicts, or security settings. In this article, we will break down the main causes and provide step-by-step solutions to restore VMware functionality.

Causes

Before applying solutions, it's important to understand what exactly is causing the failure. Below are the most frequent reasons why VMware does not start on Windows:

1. The VMware Authorization Service is not running or is disabled. This service is critical for VMware operation, and if it is stopped, the program will not start.
2. Conflict with Hyper-V. On Windows 10 and 11, Hyper-V may be enabled by default or after updates, leading to a conflict with the VMware hypervisor.
3. Corrupted or outdated VMware drivers. The vmnet, vmmon, and vmci drivers handle networking, monitoring, and data exchange. Their corruption or incompatibility with the system causes failures.
4. Antivirus or firewall blocking VMware. Some security programs may mistakenly identify VMware processes as threats and block them.
5. Insufficient user permissions. If VMware is run without administrator rights, or if the user lacks access to the virtual machine folders, the launch may fail.
6. Corrupted VMware installation. Program files may have been damaged during installation or after a system update.
7. Hardware virtualization issues. If support for VT-x (Intel) or AMD-V (AMD) is disabled in BIOS/UEFI, VMware cannot use the hypervisor.

Solution 1: Restart the Computer

Sometimes a simple computer restart can resolve the problem, especially if services or drivers have temporarily "frozen." Before moving on to more complex methods, restart your system and try launching VMware again.

Solution 2: Start and Configure the VMware Authorization Service

The VMware Authorization Service (VMware Authorization Service) should be set to start automatically. If it is stopped, VMware will not launch.

1. Press Win + R, type services.msc, and press Enter.
2. In the list of services, find VMware Authorization Service.
3. If the service status is "Stopped," right-click and select Start.
4. To prevent the issue from recurring, right-click the service, select Properties, set the Startup type to Automatic, then click Apply and OK.
5. If the service is missing from the list, it may not have been installed. In this case, reinstall VMware (see Solution 6).

After starting the service, try opening VMware again.

Solution 3: Disable Hyper-V

Hyper-V, the built-in Windows hypervisor, conflicts with VMware because both try to control hardware virtualization. Disable Hyper-V so VMware can use VT-x/AMD-V.

Through Control Panel:

1. Open Control Panel -> Programs and Features -> Turn Windows features on or off.
2. In the list, find Hyper-V and uncheck it.
3. Click OK and restart your computer.

Through PowerShell (Administrator):

Disable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V-All

After disabling Hyper-V, restart the system and check if VMware starts.

⚠️ Important: If you use other hypervisors like VirtualBox, ensure they are also not conflicting. Some versions of VirtualBox may require Hyper-V to be disabled.

Solution 4: Update VMware Drivers

Outdated or corrupted VMware drivers are a frequent cause of failures. Update them to the latest version.

1. Visit the official VMware website: https://www.vmware.com/support/downloads.html.
2. In the downloads section, find your version of VMware Workstation or Player.
3. Download and install the latest drivers, especially VMware Network Driver (vmnet) and VMware Monitor Driver (vmmon). These are usually included in the full installation but can be downloaded separately.
4. After installation, restart your computer.

If the drivers fail to install, try removing them manually via Device Manager (under "Network adapters" and "System devices"), then reinstall them.

Solution 5: Check Antivirus and Firewall

Antivirus programs and the Windows Firewall can block VMware processes. Temporarily disable them for diagnosis.

1. Disable antivirus: Right-click the antivirus icon in the system tray and select disable for 10-15 minutes. For third-party antivirus, go into its settings.
2. Disable Windows Firewall: Open Control Panel -> Windows Defender Firewall, select "Turn Windows Defender Firewall on or off," and disable it for both private and public networks.
3. Try to start VMware. If it starts, the issue is with security software.
4. Add exceptions for VMware:
   • In your antivirus, add the VMware installation folder (by default C:\Program Files\VMware\) and the processes vmware.exe, vmware-vmx.exe to exclusions.
   • In Windows Firewall, create a rule allowing inbound and outbound connections for these processes.

💡 Tip: Some antiviruses, such as Avast, AVG, and Kaspersky, are known to conflict with VMware. Check their settings or consider switching to a different security solution.

Solution 6: Reinstall VMware

If none of the previous steps helped, your VMware installation may be corrupted. Completely uninstall and reinstall the program.

1. Uninstall VMware via Programs and Features in Control Panel.
2. Download and run the VMware Cleanup Utility from the official website or GitHub to remove leftover files and registry entries.
3. Restart your computer.
4. Download the latest version of VMware Workstation or Player from the official website and install it, running the installer as an administrator.
5. After installation, try to start VMware.

When reinstalling, ensure the selected version is compatible with your system (e.g., VMware Workstation 17.x for Windows 10/11).

Prevention

To avoid the "VMware won't start" problem from recurring, follow these recommendations:

• Regularly update VMware. Install the latest versions, which include fixes for Windows compatibility.
• Do not install multiple hypervisors simultaneously. If you use VMware, disable Hyper-V and other hypervisors like VirtualBox (unless needed).
• Check services after Windows updates. After major Windows updates, the VMware Authorization Service may become disabled. Ensure it is running.
• Configure antivirus during installation. When installing VMware, add exceptions for its folders and processes in your antivirus to prevent blockages.
• Back up your virtual machines. If a virtual machine becomes corrupted, you can restore it from a backup.
• Enable hardware virtualization in BIOS/UEFI. Ensure VT-x or AMD-V is enabled in your computer's BIOS/UEFI settings.

Following these steps will help keep VMware operational and minimize failures.