The Run entry on the Start menu is not readily available in Windows Vista. If you had a habit of using the Run entry in your previous operating sytems tha is if you need the Run on the Start menu for sure, you just neeed to do the following steps for activating it.
1. Right click ‘Start’ button and take ‘Properties’.
2. Click ‘Customize’ in the ‘Start’ menu.
3. In the ‘Advanced’ option, scroll down and find the ‘Run command’ check box and select it.
4. Click on the ‘OK’ button for saving the changes.