Open the Microsoft Excel 2007 application on your computer and then click on the "Microsoft Office" button.
2
Click on the "Excel Options" button from the bottom of the application and then click on the "Add-ins" button.
3
Select the "Excel Add-ins" option from the "Manage" box and then click on the "Go" button.
4
Click on the box next to the "Analysis ToolPak" field so that it's selected and then click on the "OK" button.
5
Click on the "Yes" button if you are prompted to install the add-in for your computer. Once the add-in is loaded, click the "Data Analysis" button from the "Data" tab.

Varēju jau linku iemest, bet man neļāva :O

Pie Addoniem, ja nemaldos, jāiespējo.

EDIT: #1. jau pasteidzās. :P