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There are some troubleshooting steps for OpenGL here:
You may just need to remove the OpenGL plug-in, which is solution 5 in the document that I linked to.
omg thank you so much....looks like its working again....you made me really happy....one more question....I'm just a teenager who's having fun on VFX i plan to buy After Effects CS5 but these 1.000 and don't know what, are damn much money for me....the trial is crashing often or has got problems....is the full version crashing often too?because if it does that wouldn't be a godd deal....
The first thing is to ensure that your computer meets the system requirements:
Also, you mentioned trying several formats that didn't work. Some of those aren't included in the trial version. Read this to see the limitations of the trial version: