Searching in Windows 7

Here is a screencast (video) in MOV (8 MG) and WMV (6 MG) file format on doing a search in Windows 7.

Here is a different screencast in the form of a PowerPoint presentation in doing a search in Windows 7 in MOV (3 MG), WMV (3 MG) and Flash with a quiz (2 MG) format. Download or look at online.

Please let me know which of these 5 files presents the information the best. Which is these is best to use for teaching? Thanks