To get Run back on your Start menu, right click your Start button and select
Properties from the menu.
On the Start menu properties sheet, hit the Customize button.
If you're using the XP style Start menu, click on the Advanced tab.
Look in the Start menu items box for the Run command and make sure it's checked.
If you're using the classic menu, check Display run.
Click OK twice and check your Start menu.
Note: You can also launch Run by hitting the Windows and R keys at the same
time.