Problem: Copy, paste, device manager do not work, there is error message not allowing it
Even though administrator is logged in.
Solution is here:
http://www.vistahelp.ca/phpBB2/viewtopic.php?t=543&sid=6f0880301c7d67caea8b2398fd2faeed
There is a program Take Ownership, which after is run allows administrator to right click drive C and replace in Security tab current owner (which was nobody) into administrator: