All you have to do to fix this is just double click in any of the empty space in task manager. For example just double click in between "Show processes from all users" and "end process", this will bring back your normal task manager.
I am running Windows 7 Professional 32 bit with 3 GB SDRAM and lots of HD space. When I open Task Manager, I only get a truncated version. Only the Tasks screen is available and it does not have x to close it. Once opened, to close Task Manager, I have to right click the icon in the Task Bar and select close to exit.
How can I get a fully functional Task Manager back?