unscanable file detected when using norton for exchange

[dnack]

How come .scr virus cannot be scan and quarantine?

Dnack
Thank You



9:51 AM Warning VirusFound The message "Re: Fw: Weight Ind" located in "E'nez Teo\Inbox" had the following actions taken on it:
Attachment plot.log.scr was Logged Only for the following reasons:
Unscannable File Detected
7/15/2003 9:51 AM Warning UI Failed to quarantine attachment named "plot.log.scr"
in message with subject "Re: Fw: Weight Ind"
in "XXX \Inbox".
7/15/2003 9:51 AM Error Error Scan Engine Failure.
HRESULT = 0x80004005. This error occurred while scanning the attachment "plot.log.scr" of message "Re: Fw: Weight Ind" located in "XXX\Inbox".
7/15/2003 9:22 AM Warning Service The process navesp.exe was restarted.
7/15/2003 9:22 AM Warning Service The process navesp.exe was restarted. 7/15/2003 9:22 AM Warning VirusFound The message "FW: Philips Carnival Sales 2002" located in "XXX\Inbox" had the following actions taken on it:
Attachment winzip80.exe.pif was Logged Only for the following reasons:
Unscannable File Detected