I think i found something to take look at ...
i noticed there are running two instances of msiexec.exe after boot (in time when Windows are like stuck on darkscreen),
i was wondering why and what started it so i took closer look and what i see
info of BOTH !!! of them (notice exact same commandline):
CMD = MsiExec.exe /qn /x{773410C0-7622-4949-A598-2F671CF337EA}
Curr Dir = E:\Programy\Antiviry\Avast 4.5\
Path = C:\WINDOWS\system32\MsiExec.exe
in moment these 2 instances of msiexec close booting resume and Windows load explorer.exe ...