Question: I know that usually a short video with audio is called "clip", but at least for me, it's associated with a music video, MTV, etc, and doesn't sound professional enough.

So is there a single word for a short video promoting a company, showing the company skills and past achievements etc?

It is going to be used in a presentation which is going to start with the video, and contains Table of Contents as the first slide. So far we have "[company name] Video Clip" but like I said in the beginning, it doesn't feel right. Neither me nor the audience of the presentation are native English speakers, if it matters.

Answer: 
The word [***promo***](http://www.wolframalpha.com/input/?i=promo&t=crmtb01) is often used.

Simply an abbreviation of promotional video, it is widely used to describe the type of short video that you mention. A video concentrating on the company itself rather than an advertisement which concentrates on its products.
*[Presentation](http://www.thefreedictionary.com/presentation) video* is the expression generally used: 

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> * (Commerce) a verbal report presented with illustrative material, such as slides, graphs, etc: a presentation on the company results.
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(TFD)