Hi mysticdreams
You can fix this error by :
1-Go to the start menue and choose Run.
2- Write ( gpedit.msc ).
3-Then, User interface (components)>>adminstration Templetes>>system>>Ctrl+Alt+Del choices
from the right window double click on the "Removing the task manager" (the first choice in the list) then you will
find three choices,choose the first one or the thired one (disable) then press apply and ok.
I hope I could help you
I am waiting for your comments.
PRINCE