diff --git a/packages/cli/bin/tinyagi.mjs b/packages/cli/bin/tinyagi.mjs
index 0c81fe4f..1d85364a 100755
--- a/packages/cli/bin/tinyagi.mjs
+++ b/packages/cli/bin/tinyagi.mjs
@@ -3,6 +3,7 @@
 import { execSync, spawn } from 'child_process';
 import fs from 'fs';
 import path from 'path';
+import { fileURLToPath } from 'url';
 
 // ── Constants ────────────────────────────────────────────────────────────────
 
@@ -21,7 +22,7 @@ function log(color, msg) {
     process.stdout.write(`${color}${msg}${NC}\n`);
 }
 
-const REPO_ROOT = path.resolve(new URL('.', import.meta.url).pathname, '../../..');
+const REPO_ROOT = path.resolve(fileURLToPath(new URL('.', import.meta.url)), '../../..');
 const CLI_DIR = path.join(REPO_ROOT, 'packages/cli/dist');
 
 // ── CLI Script Runner ────────────────────────────────────────────────────────
@@ -239,7 +240,7 @@ switch (command) {
             execSync(`cd "${officeDir}" && npm run build`, { stdio: 'inherit' });
         }
         log(GREEN, 'Starting TinyOffice on http://localhost:3000');
-        const child = spawn('npm', ['run', 'start'], { cwd: officeDir, stdio: 'inherit' });
+        const child = spawn('npm', ['run', 'start'], { cwd: officeDir, stdio: 'inherit', shell: process.platform === 'win32' });
         child.on('exit', (code) => process.exit(code || 0));
         break;
     }
diff --git a/packages/cli/lib/defaults.mjs b/packages/cli/lib/defaults.mjs
index 575bc6df..2f75fd39 100644
--- a/packages/cli/lib/defaults.mjs
+++ b/packages/cli/lib/defaults.mjs
@@ -1,6 +1,7 @@
 import fs from 'fs';
 import path from 'path';
 import os from 'os';
+import { fileURLToPath } from 'url';
 
 const TINYAGI_HOME = process.env.TINYAGI_HOME || path.join(os.homedir(), '.tinyagi');
 const SETTINGS_FILE = path.join(TINYAGI_HOME, 'settings.json');
@@ -40,7 +41,7 @@ function expandHome(p) {
  * Determine SCRIPT_DIR (repo root) — same logic as tinyagi.sh.
  * When running from packages/cli/lib/defaults.mjs, go up 3 levels.
  */
-const SCRIPT_DIR = path.resolve(new URL('.', import.meta.url).pathname, '../../..');
+const SCRIPT_DIR = path.resolve(fileURLToPath(new URL('.', import.meta.url)), '../../..');
 
 function copyDirSync(src, dest) {
     fs.mkdirSync(dest, { recursive: true });
diff --git a/packages/cli/src/install.ts b/packages/cli/src/install.ts
index 6f707444..032a13d9 100644
--- a/packages/cli/src/install.ts
+++ b/packages/cli/src/install.ts
@@ -24,8 +24,11 @@ function log(color: string, msg: string): void {
 }
 
 function commandExists(cmd: string): boolean {
+    const probe = process.platform === 'win32'
+        ? `where ${cmd}`
+        : `command -v ${cmd}`;
     try {
-        execSync(`command -v ${cmd}`, { stdio: 'ignore' });
+        execSync(probe, { stdio: 'ignore' });
         return true;
     } catch {
         return false;