I have a problem with my desktop after I set up window XP professional service pack 3. I found that I can't run task manager (Task Manager has been disabled by your administrator). I also cannot run RegEdit. What is more frustrated, my computer is supper slow and I cannot do anything. Microsoft Outlook configuration always happens at start up and if I press cancel, there are are hundreds of error messages appear that force me to press button shut down.
Anyone has any ideas?