Apple Support Couldn't help..files won't open

Hey guys,

I just called apple support and they don't know what's wrong. So I was wondering if you guys would happen to know..

The past month's of .mov files won't open up anymore in final cut, quicktime, after effects, or mpeg streamclip.

When I render/export them out originally I can watch them fine, but the next day the error pops up when I try to import it or open it up

in quicktime : the movie could not be opened. the file is not a movie file.
in after effects "After Effects Error: file '.mov' cannot be imported --files of type "MooV" are not supported. "
final cut pro: file error: Unknown file.


The weird part about it, is that I can watch them fine right after I make them originally...

any ideas? even ideas of who to talk to would be great.. Should I try clearing off my computer hard drive and re-install everything?

Paul
Thanks for the help!



SPECS:


Model Name: Mac Pro
Model Identifier: MacPro2,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 8 MB
Memory: 16 GB