can you view any of your old downloads?..i.e. is this problem just with newly acquired files, or all files past and present?

I use the Download K-Lite Codec Pack so that I can view most all video files...its possible that the new install somehow blew the old codecs offa your machine, as it were, and installing a codec pac will perhaps solve the issue...

I'm going to assume you're using windows here...start>control panel>add remove programs....check that list and if you already have a codec pac installed, uninstall it before installing a new one...

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So Long and Thanks for All the Files
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