I am using the free AVG anti virus but i'm confused about the scan results?

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every time i run a scan two objects come up in the list of infected files but they do not get listed as a threat..they are c:\windows32\shell32.dll c:\windows32ntoskrnl.exeI can't find any info on the AVG site about these and i can't delete them or anything...do any of you know if these are a security threat..virus etc