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Difficult to say if you haven't made any changes to the system configuration and it happens with files that previously played correctly.
Just to make sure, these files worked properly before?
What kind of system? (operating system, processor, video card)
Are these files on a hard drive or on a cd/dvd?
Did you quit other running applications?
Malware could contribute. You may have picked up something without knowing.
Check task manager to see if anything is hogging the CPU.
Did you change to a higher screen resolution?
You get the idea. Let us know.
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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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