Today I opened a website link, and the auto-scan browser told me I had Bloodhound.pdf.10.  The virus removal technician worked on the computer, and told me that the virus was removed.  However, when I open Symantec Antivirus, and navigate to risk history, there still is an entry for the infection.  When I select it, and hit delete, I get a message saying that the "action cannot be taken", because either 1) the files have been moved or deleted, 2) the computer they are located on is turned off, 3) you are trying to clean files located in an email message, 4) you are trying to clean files in a compressed folder.  I am hoping that number 1 is true, because I don't think that 2, 3, or 4 are right.  There is nothing in the symantec quarantine folder, and the computer seems to be working ok.  I am just confused (and nervous) as to why there is still this entry in the risk history that I can't get rid of.  Please help.