What shall i do, When i run system scan adaware stops in this file.
c:\program files\w\.layer\wmpnscfg.exe
Is a virus or what?

Does the scan freeze, or does it finish? Ad-Aware will tell you if it detects malicious files. You need to provide more information or a screenshot to show what you mean. The file you describe appears to be Windows Media Player:

http://www.bleepingcomputer.com/startups/W....exe-17104.html