Win task manager

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I've got a little problem with my desktop PC - a while ago I removed some spyware or sth. but now instead of task manager (ctrl+alt+del) there is message "administrator restricted your acces to task manager" ... Do you have some similar experience? What can I do? Everything else is running fine but you know, windows without CtrlAltDel is like FTW wihout without winger skill :) Thanx in advance for every usefull info...