NAV 2010 continues to "detect" a virus event after it has been removed = bug?

NAV found a trojan horse on my network drive. I deleted the file; however, every so often NAV pops up and says "Trojan Horse Remove Failed - Access Denied".  If I click rescan, the message returns. If I click get help, it says "All security risks have been resolved" only to pop back up in 10 minutes.  How do I make this go away?

 

error.jpg

 

error2.jpg