Now can I delete "AshWebSv.dbg?
(It’s very big). 
Why did you delete it?Is it a bad file? ???
where do you find this file?
and do not delete this file, it can do something with avast
It is a debug file generate from the beta version of avast.
It is locate in C:\Documents and Settings\All Users\Dati applicazioni\Alwil Software\Avast5\log.
Wait for instructions from the Avast team.
I have it in this path
C:\ProgramData\Alwil Software\Avast5\log
just get about 20mb’s 
but i have there only *.log files ???
It was generated by some beta version of 5.1, you can safely delete it. Thanks for beta testing!
Ok deleted!
Thank you Lukor.