I created a simple C program to demonstrate how Virtual Machine (VM) detection works by checking for registry keys commonly found in virtualized environments (like VirtualBox).

• The code checks for the registry key SYSTEM\CurrentControlSet\Services\VBoxGuest (a default VirtualBox entry).
• If the key exists, it assumes the system is a VM and shows an alert.
• If not, it assumes a physical machine (though this isn't 100% reliable).

• ✅ Uses Windows API (RegOpenKeyExA) for registry access.
• ✅ Lightweight and easy to modify for other VM providers (VMware, Hyper-V, etc.).
• ✅ Displays a pop-up alert (MessageBox) with the result.

• Great for learning Windows API/registry interactions.
• Demonstrates basic anti-VM techniques (useful in security testing).
• Can be expanded with more checks (CPUID, disk drivers, etc.).