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I am familiar with two, both of which are very good. They both have trial versions, so you can see which one you like better.<br />
<br />
NXPowerLite<br />
<a href="http://www.nxpowerlite.com" rel="ugc">http://www.nxpowerlite.com</a><br />
<br />
PPTools Optimizer<br />
<a href="http://www.pptools.com/optimizer/index.html" rel="ugc">http://www.pptools.com/optimizer/index.html</a>
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I am familiar with two, both of which are very good. They both have trial versions, so you can see which one you like better.

NXPowerLite
http://www.nxpowerlite.com [http://www.nxpowerlite.com]

PPTools Optimizer
http://www.pptools.com/optimizer/index.html [http://www.pptools.com/optimizer/index.html]

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Oh, sorry, just noticed you're asking for free minimizers. I don't even know of any.<br />
<br />
PowerPoint itself has picture compression options; those alone should help lower file size, as will turning off Fast Saves and doing these things listed here: <br />
<br />
Why are my PowerPoint files so big? What can I do about it?<br />
<a href="http://www.pptfaq.com/FAQ00062.htm" rel="ugc">http://www.pptfaq.com/FAQ00062.htm</a>
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Oh, sorry, just noticed you're asking for free minimizers. I don't even know of any.

PowerPoint itself has picture compression options; those alone should help lower file size, as will turning off Fast Saves and doing these things listed here:

Why are my PowerPoint files so big? What can I do about it?
http://www.pptfaq.com/FAQ00062.htm [http://www.pptfaq.com/FAQ00062.htm]

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That's great and for windows media video files?
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That's great and for windows media video files?

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which is the best free file minimiser for powerpoint presentations and for windows media video files? 
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which is the best free file minimiser for powerpoint presentations and for windows media video files? 

which is the best free file minimiser?

PowerPoint is a slide show presentation program currently developed by Microsoft. PowerPoint presentations consist of a number of individual pages or "slides" that may contain text, graphics, sound, movies, and other objects, which may be arranged freely. The presentation can be printed, displayed live on a computer, or navigated through at the command of the presenter. Slides can also form the basis of webcasts.

Microsoft PowerPoint

A presentation program is a software package used to display information in the form of a slide show. It has three major functions: an editor that allows text to be inserted and formatted, a method for inserting and manipulating graphic images, and a slide-show system to display the content. Presentation program is supposed to help both the speaker with an easier access to his ideas and the participants with visual information which complements the talk.