Adobe Reader 8.1.2 mysteriously vanishes after being installed

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hello,

this has happened me 4 times in past month: go open pdf file , computer tells me don't have program open it. go add/delete programs list, , sure enough, adobe reader no longer installed. i'm on fourth re-installation today. weird sounds program listerally vanishes in middle of night. installed , updated 1 night, , next morning gone again.

i've checked viruses haven't found any. has happened 4 times, i'm pretty sure haven't been unconsciously deleting program.

please help!



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