diff --git a/scripts/setup-windows.ps1 b/scripts/setup-windows.ps1
new file mode 100644
index 0000000..44136a2
--- /dev/null
+++ b/scripts/setup-windows.ps1
@@ -0,0 +1,68 @@
+# ZeroGravity — Windows setup
+# Creates config directories, builds the release binary, and optionally
+# installs as a scheduled task for automatic startup.
+# Run as: powershell -ExecutionPolicy Bypass -File scripts\setup-windows.ps1
+
+$ErrorActionPreference = "Stop"
+$ProjectDir = Split-Path -Parent (Split-Path -Parent $PSScriptRoot)
+if (-not $ProjectDir) { $ProjectDir = (Get-Location).Path }
+
+# ── 1. Config directory ──
+Write-Host "→ Setting up config directory…"
+$ConfigDir = Join-Path $env:APPDATA "zerogravity"
+New-Item -ItemType Directory -Force -Path $ConfigDir | Out-Null
+Write-Host "  $ConfigDir"
+
+# ── 2. Data directory ──
+Write-Host "→ Setting up data directory…"
+$DataDir = Join-Path $env:TEMP "zerogravity-standalone"
+New-Item -ItemType Directory -Force -Path $DataDir | Out-Null
+Write-Host "  $DataDir"
+
+# ── 3. Build ──
+Write-Host "→ Building release binary…"
+Push-Location $ProjectDir
+cargo build --release
+Pop-Location
+
+$Binary = Join-Path $ProjectDir "target\release\zerogravity.exe"
+if (-not (Test-Path $Binary)) {
+    Write-Error "Build failed — $Binary not found"
+    exit 1
+}
+Write-Host "  Built: $Binary"
+
+# ── 4. Scheduled task (optional) ──
+$TaskName = "ZeroGravity Proxy"
+$Existing = Get-ScheduledTask -TaskName $TaskName -ErrorAction SilentlyContinue
+
+if ($Existing) {
+    Write-Host "→ Scheduled task '$TaskName' already exists. Updating…"
+    Unregister-ScheduledTask -TaskName $TaskName -Confirm:$false
+}
+
+Write-Host "→ Creating scheduled task '$TaskName'…"
+$Action = New-ScheduledTaskAction `
+    -Execute $Binary `
+    -WorkingDirectory $ProjectDir
+
+$Trigger = New-ScheduledTaskTrigger -AtLogOn
+$Settings = New-ScheduledTaskSettingsSet `
+    -AllowStartIfOnBatteries `
+    -DontStopIfGoingOnBatteries `
+    -RestartCount 3 `
+    -RestartInterval (New-TimeSpan -Minutes 1)
+
+Register-ScheduledTask `
+    -TaskName $TaskName `
+    -Action $Action `
+    -Trigger $Trigger `
+    -Settings $Settings `
+    -Description "ZeroGravity OpenAI-compatible proxy" | Out-Null
+
+Write-Host "  Installed as logon task."
+Write-Host ""
+Write-Host "✓ Setup complete."
+Write-Host "  Start now:  schtasks /run /tn '$TaskName'"
+Write-Host "  Stop:       schtasks /end /tn '$TaskName'"
+Write-Host "  Or manually: .\target\release\zerogravity.exe"