Fedora 16 KDE - start problem

Mon Feb 13 08:44:01 UTC 2012

I have updated my Fedora 16 after install from Live-CD. 
After that I have rebooted the system. But when i logged there were no taskbar, only icons on the desktop. 
And then tried to open file manager Dolphin, Web-browser, but i couldn't see these windows.
When I pressed Alt+Tab i saw window's headers, but not windows. 

What I must do to make my Fedora 16 work good?
Please, help.