You're right, and my error. You clearly said Excel 2007 and the link I gave was for Excel 2003, so my apologies for that.
Like you say, there doesn't seem to be a chard wizard in Excel 2007. instead the steps are governed by the ribbon menus that appear when you take certain actions. I pulled this from one site I found;
"The Chart Wizard
A full discussion of Excel's many charting options is beyond the scope of this handout. However, it is fairly straightforward to create a simple chart (and some complicated ones) using the chart wizard. Just highlight the data you wish to base your chart on (including header rows, if you have any) and click on the appropriate chart button under the Data tab. If you use the old F11 shortcut, a chart will be created automatically for you.
Once the chart is created, a new Chart Tools section is added to the right side of the Ribbon. The three tabs therein (Design, Layout, and Format) allow you to make different kinds of changes. Roughly speaking, Design allows you to make changes to the basic options regarding the chart (whether it's a worksheet or an object, what kind of chart is it, etc.), Layout allows you to add/edit/delete chart items like the title, legend, and so on, and Format allows you to change the appearance of the chart."
It still mentions the chart wizard but I don't believe it appears the same as the old wizard use to do. I hope that helps.
If not, can you tell us more about the particular problems you are having?