Hi,
When you say old, how old is it? (what is the version number)
VS2008 was officially supported from version 4.0, and there were some issues that needed to be solved in order for everything to work under 2008.
If the version that you have is 4.0 or newer all you need to do is just reinstall it. The re-installation process will place 2008 add-in and you should get the tool menu.