Hi Brew,
I assume you mean Analysis Toolpak. This should be installed when you install Office. If you did a Typical install, it's very likely you didn't install it. Close any office apps then...
Insert the original Office disk, select the option to modify the installation, and set it to install all the addins and wizards etc.
Once it completes, go through Tools > Addins and you should see the Analysis Toolpak listed. Check it and you're away.
Denis