Don’t worry – we had the same problem when we launched Windows Vista for the first time. Add/Remove Programs is not missing – it was just renamed for some reason to Programs and Features and it is very easy to find, like always.
First, go to Control Panel. If you don’t you use the Classic View you will see a section called Programs and beneath it there is the Uninstall a program option. Click on it and you arrived to the right place.
If you are using the Classic View, you will find Programs and Features in the list of items that start with the letter “P”.
Another option would be to type “add remove” in the search box and Windows Vista will return the shortcut to Programs and Features.