To add a flash control follow the steps below which are from the following article.
http://support.microsoft.com/kb/291875

1. In PowerPoint, display in normal view the slide on which you want to play the animation.
2. Click File, and then click Options.
3. Click Customize Ribbon, and then check the check box labeled Developer in the right list, and then click OK.
4. On the Developer tab, click the More Controls button in the Controls group.
5. In the list of controls, click Shockwave Flash Object, click OK, and then drag on the slide to draw the control.
6. Resize the control by dragging the sizing handles.
7. Right-click the Shockwave Flash Object, and then click Properties.
8. On the Alphabetic tab, click the Movie property.
9. In the value column (the blank cell next to Movie), type the full drive path, including the file name (for example, C\:MyFile.swf) or uniform resource locator (URL) to the Flash file that you want to play.

Let me know if there is anything else you need.