Laszlo thank you for helping, but your idea didn't work out
I have administrator privileges and I reinstalled AC several times but nothing.I said before there is some kind of icon on desktop, and it looks like damaged program.When i attempt to start the program appears message: Missing icon, and Windows was searching for it.But after unsuccessful search it recommended me the nearest location.I clicked OK but it was worse. Now I get error C:\Documents and Setings\User\Local Setings\Temp\i4j45866.exe is not a valid Win32 application.
So do you have any idea what else can I try. I forgot to say, I tryed to install it in safe mode, but it just extracted installationation and nothing, it just stopped.