igor0
2
The three system files (kernel32.dll and winsock libraries) are put to the Chest during the installation of avast. It is just a security measure - these files are often the target of viruses; if you happen to be infected in the future, you may restore the original files from Chest.
The pav.sig file is a file used (of left) by Panda antivirus (or their cleaning tool). They store the virus signatures in an unencrypted form inside - therefore other antivirus programs report is as infected. You may consider it a false alarm, i.e. there’s no reason to worry about it.