1. Click on Start->Control Panel
2. Click on "Add or Remove Programs"
3. Click on "Add/Remove Windows Components"
4. Select "Internet Information Services (IIS)" and click on details
5. Make sure the "Common Files", "Internet Information Services Snap-In" is checked, select "World Wide Web Service" component and click on "Details"
6. Make sure "Scripts virtual directory" and "World Wide Web Service" is checked.
7. Click "OK"
8. On the screen from step 5 click "OK"
9. On the screen from step 4 click "Next"