An other problem, i used "Reimage.exe" from www.reimage.com to repair my pc. it found the virus "TR/Crypt.XPack.Gen2" into the file "C:\program files\avast software\avast\wsc_proxy.exe".
A classic program conflict and false positive

Why Using Multiple Antivirus Programs is a Bad Idea
https://www.kaspersky.com/blog/multiple-antivirus-programs-bad-idea/2670/