No video previews in finder

Hello,
I have snow leopard 10.6.8 and my imac is a few weeks old. I cannot preview video files in finder by hitting the spacebar, whereas I could do this before. Apart from a .mov file I have, which works fine, nothing else (.avi etc) works. These files, btw, work fine when I open them in VLC or quicktime. All other (image or text) files allow me to preview in Finder. After browsing the internet for tips, I tried previewing these files from a different user account, with no luck. I updated all software, tried defaulting all file formats to open in Quicktime (i had vlc on default before), no luck either.
Any ideas?

Nevermind, I solved it by installing Perian. This always happens to me, after two weeks of trying to figure something out I finally ask for help and then solve it anyway within minutes. Can't find how to delete my question though but it might be of use to others in the future.

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No video previews in finder

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