docs: add Windows installation guide for SDK

README.md

@@ -22,7 +22,7 @@ OpenGradient enables developers to build AI applications with verifiable executi
 pip install opengradient
 ```
 
-**Note**: Windows users should temporarily enable WSL during installation (fix in progress).
+**Note**: > **Windows users:** See the [Windows Installation Guide](./WINDOWS_INSTALL.md) for step-by-step setup instructions.
 
 ## Network Architecture
 

WINDOWS_INSTALL.md

@@ -0,0 +1,34 @@
+# Windows Installation Guide
+
+The `opengradient` package requires a C compiler to build its native dependencies. Windows does not have one by default.
+
+## Step 1 — Enable WSL
+
+Open PowerShell as Administrator and run:
+
+    wsl --install
+
+Restart your PC when prompted.
+
+## Step 2 — Install Python inside WSL
+
+    sudo apt update && sudo apt install -y python3 python3-pip python3-venv
+
+## Step 3 — Create virtual environment
+
+    python3 -m venv og-env
+    source og-env/bin/activate
+
+## Step 4 — Install SDK
+
+    pip install opengradient
+
+## Step 5 — Verify
+
+    python3 -c "import opengradient; print('Ready!')"
+
+## Common Errors
+
+- Visual C++ 14.0 required → Use WSL instead
+- wsl: command not found → Update Windows 10 to Build 19041+
+- WSL stuck → Enable Virtualization in BIOS