What's the folder view style?
If thumbnails, set to List and see if the problem still happens.
If that clears it up you probably have a currupted thumbs cache.
Use Tools->Folder Options->View to:
- Show hidden files
- Unhide protected operating system files
Then delete Thumbs.db for that folder.
Restore your view settings and try again.
If it only happens when you click on certain media files, what file suffixes? Verify you have the necessary codecs installed or just disable preview for those types.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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