After installing office 2013 home preview, and then uninstalling it, my powerpoint 2010 can no longer open up .pptx files downloaded from the net
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Has anyone run into this issue and do you know how to make sure office 2013 home preview is completely uninstalled.

I installed office 2013 home preview and then uninstalled it.  Now however my powerpoint 2010 can no longer open up any powerpoint files downloaded from the net, inlcuding dropbox or skydrive for example.

Any solutions?