Summarize the following:
Select Microsoft Excel from the Start menu to open it. Once you’ve launched Excel, you can either choose to open an existing Excel file or create a new one. If you choose to create a new document to link to a PowerPoint presentation, you need to save it first as an Excel file before you can do any kind of linking. Launch Microsoft PowerPoint by selecting it on from the start menu. Once it launches, you can either open an existing PowerPoint presentation or create a new one by clicking the File button on the upper-left corner of the menu bar.

Summary:
Open the Excel file you wish to link with the PowerPoint presentation. Open the PowerPoint file you wish to have the Excel file linked to.