Is the Toolbox panel shown?
With the default settings, the 'Windows Forms' Tab is only displayed when designing either a Form or an inherited control that can have components added to it (if you are in a code page, the 'Windows Forms' tab will not be displayed).
To add controls and components to a tab that you add, right click under the tab and select 'Customize Toolbox...'
Do you have to add all the components that you want or is there a default list of components that gets added when you start a new project. The reason I ask is because I thought I saw a list of components in the Windows Forms tab and I thought that maybe I erased it by accident.