Tak se mi podařilo najít řešení zde:
http://social.technet.microsoft.com/Forums/windows /en-US/f05b494f-0f51-4430-8a7f-c6e11cdf148b/my-des ktop-icons-all-have-locks-on-them?forum=w7itproui

přesněji sem udělal toto:

The CORRECT FIX for this.....

browse to C:\Users

Right click on the correct Users folder and select Properties.

Goto the Securities tab and click Advanced.

Click Change Permissions.

Highlight the Name SYSTEM in the User selection window.

Tick the box for 'Replace child object permissions with inheritable permissions from this object'.

Click Apply.

The correct security rights will be restored without giving ALL local users access to your files.