You're off topic for this forum, which is dedicated to Windows Live OneCare. You may want to try the Microsoft Public newsgroups here: http://www.microsoft.com/communities/newsgroups/list/en-us/default.aspx
However, there should only be a single process called Task Manager, which will appear when you use Ctrl-Alt-Del to launch Task Manager to view running processes. If you reboot the PC and immediately launch Task Manager and see more than one instance, I'd say that the PC is possibly infected by something and a full virus scan with an up to date scanner would be the first order of business.
-steve