File is damaged or cannot be repaired

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i have adobe reader on vista os. when try open pdf file, either message states must exit adobe , when click "ok," file opens. however, on occasion, i'll following error message in cannot open file , blank adobe window opens:

"file damaged or cannot repaired."

has experienced similar problem? solutions? thanks.

i had same problem adobe reader 7, vista os. downloaded adobe reader 8 , tried open file again, , got same error. noticed file size 0. finally, downloaded pdf file website again, , able open pdf file adobe reader 8. had same problem 2nd file. repeated above steps: downloaded file again, , opened adobe reader 8, , able read it.


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