The most effective "fix" involves adding specific configuration lines to the VM's settings file. the virtual machine and close VMware completely. Navigate to the folder where your VM is stored. Locate the file ending in .vmx (e.g., Windows10.vmx ). Open it with Notepad or another text editor. Scroll to the very bottom and add the following lines:

Actionable recommendation (step-by-step)

This guide breaks down exactly why this happens and provides step-by-step solutions to bypass the VMware block, optimize your environment, and ensure stable tuning performance. Why WinOLS 4.51 Blocks VMware Environments

Do not use outdated versions of VMware. Use VMware Workstation 16 Pro or 17 Pro.

Running in a VMware environment is a popular choice for ECU tuners needing a stable, isolated workstation. However, because WinOLS actively checks for virtualization, it often triggers a "VM Detected" shutdown or fails to launch, requiring specific fixes to make it run. 51 in VMware (Workstation 17.5+). The Core Problem

If the Dlls folder is empty or missing files, you must copy the unlocked checksum .dll files from your original installation package. Open WinOLS, go to →right arrow Configuration →right arrow

This is the most effective method to hide the VMware environment from WinOLS. the virtual machine completely.

Note: The lines starting with monitor_control are powerful; they slow down your VM slightly but effectively mask the backdoor I/O port.

Sometimes, simply presenting the physical dongle disables the VM check. If not, combine with Method 1.

About the author

winols 451 vmware fix

Muhammad Qasim

Muhammad Qasim is an English language educator and ESL content creator with a degree from the University of Agriculture Faisalabad and TEFL certification. He has over 5 years of experience teaching grammar, vocabulary, and spoken English. Muhammad manages several educational blogs designed to support ESL learners with practical lessons, visual resources, and topic-based content. He blends his teaching experience with digital tools to make learning accessible to a global audience. He’s also active on YouTube (1.6M Subscribers), Facebook (1.8M Followers), Instagram (100k Followers) and Pinterest( (170k Followers), where he shares bite-sized English tips to help learners improve step by step.