I am using Symantec Antivirus Corporate Edition V9.0. Today I noticed that when I look into a folder within the application called event log, it makes notes with exclamation points that a number of files could not be opened or scanned. There are about sixty notations or events noted. I will list several of them below so that you understand what I am talking about.
Scan could not open file C:\WINDOWS\system32\drivers\atapi.sys 
Scan could not open file C:\WINDOWS\system32\config\SECURITY.LOG 
Could not scan 1 files inside C:\WINDOWS\I386\SOFTBAR.IN_ due to extraction errors encountered by the Decomposer
Scan could not open file C:\Documents and Settings\LocalService\Application Data\Webroot\Spy Sweeper\Temp\SSCS0B4752E9-74E2-4B31-846E-1F98CE7850FC.tmp 
All of the listed events are "scan omissions". Because I have several PCs all running Windows XP I checked the event logs on those as well and it is the same thing. Can anyone tell me if this is normal and if it is normal what does it mean? Why can't the antivirus program scan these files? Is there any danger that because these files can't be scanned that I could have a virus lurking in one of those files?
When I run scans, the program finds viruses on occasion but it has always removed or quaranteend the virus and makes a log of that as well.