File cas_08.cas corrupted

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Hello,I am brazillian,sorry for my english errors :3 ( I am using Google Translator)

For some reason, my game needed the Origin repair, and when it gets to 99% of the windows a message appears:

"Files or C: \ Program Files (x86) \ Origin Games \ Battlefield 3 \ Data \ cas_08.cas is corrupted"

I tried to delete this file and download again but the windows does not allow me to delete this file:

"An unexpected error is preventing you delete the file"

Paid for this jogo.E want to play it. EA Games, please help me solve this problem.

Grateful, VictorVyck