ok I did it - the results:
now the icon appears on my desktop, in start menu, in the tray, but
when I hover my mouse over the icon in the tray - it vanquishes ==> cannot open it
when I start it from the start menu or from the deskto icon in the tray it appears, but nothing else happens + if I hover the mouse over the tray icon then it vanquishes ==>cannot open it
when I start the executables, nothing happens, except the avastui - then the icon appears in the tray, but it vanquishes when I hover the mouse over it
I already scanned the machine in an offline state (hdd out + insert into a clean machine and scanned) - but it is clean (ot not known virus does this)
any idea ?