a vidi jeste, google kaže da ima veze s registryem:
Go to the following in the registry editor:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon.
In Winlogon, on the right side, there should be a value called "Shell".
Double click this value. Make sure only 'Explorer.exe' is the value of Shell, if anything else is there , simply delete it and leave 'Explorer.exe' .
Restart the computer for the changes to take effect.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs