Should I be concerned about it?

Avast Free Antivirus / Premium Security
1

There are 3 system files in the Avast! Virus Chest.
But Avast reported “no virus”.
3 system files: kernel32.dll,winsock.dll,wsock32.dll

http://f18.yahoofs.com/users/455bdd67zc2d9937c/4e86/__sr_/699bcnb.jpg?phQP.WFBIRqRCLWO

2

I was told that those were simply backups of system files, not anything to worry about.

3

Thug21 is correct.

You need only be concerned about files in the “Infected files” section of the chest.