If Task Manager won't start, your computer might have a virus. Make sure that you have up-to-date antivirus software installed on your computer, and then search the Microsoft website for the latest virus information. If your computer does not have a virus and you are connected to a network, check with your system administrator to find out if Task Manager has been turned off on your computer.
Check out this site for more great information and troubleshooting tips that should be able to help you solve your problem!
I hope this helps!
Windows Outreach Team