Hello first i’m new here 
In my quarantaine folder i have winsockdll, wsock32.dll and kernel32.dll but when i right click on the files in says there’s no viruses …so my question is , if there’s no viruses on thoses files why are they in the quarantaine zone ?
???
Hello and Welcome 
Here’s something from avast! help file which will answer your question
During the installation, avast! copies some critical system files into the Chest, under the "System files" category. Those files might cause the operating system to crash if they get infected by a virus. If needed, those files can be restored from the Chest to their original location. Should an unknown virus infect the computer despite the extensive protection from the avast! antivirus package and alter an important system file, it can then be easily restored to its original state.
The chest is broken down into different compartments/sections, Infected Files, User Files (files you believe are suspect and added by the user) and System Files. Only the first two contain viruses or suspect files.
Ok…so if i understand well there’s nothing to worry about… :D…Thanks for your quick replies…
That’s right nothing to worry about, welcome to the forums.