suspected facebook caused machine to have security leak

i have a machine suspected of being infected with malware, started from facebook. whenever this person A logs into facebook, another person B seems to know what A is doing. B can access A photos, up to the extent that A can literally see her folder on her desktop being copied over. how can we confirm on whether this is a hacking / security leak issue on the laptop?
 
grnowAsked:
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grnowAuthor Commented:
no solution would like to close the qn
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willbaclimonCommented:
That seems like a strange security risk...check for listening ports on the workstations
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clearacidCommented:
Are you using a proxy server?
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grnowAuthor Commented:
yes, we are using a proxy server...we replace the user's laptop with a spare harddisk. is there anyway we can scan the old hard disks on any logs to find out more about this?
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