Quick question about avast! Virus Chest...

Hi...

I'm running a cleaning procedure on a client's Vista 32-bit machine, and I'm at the "empty the virus chest" step...there aren't any files in the avast! Infected or User files sections, but the following show up in the System files section:

(2) instances of kernel32.dll, (1) winsock.dll, (1) wsock32.dll - all dated from 9/29/2009 or before...

Are these safe to delete, or, since they're not in the Infected files section, should I leave them alone?

Little jittery, here - this machine has some problems, but I'm loathe to wipe it and reinstall, because they've got a lot of important data...

T.I.A

 

Copy - thanks!