It could be 1 of two problems. First would be to check if you have the Microsoft Visual C++ Redistributable Package installed:
http://www.esoui.com/forums/showthread.php?t=372
If installing that doesn't help you then you are part of a small but growing group we are still trying to figure out a solution for here:
http://www.esoui.com/forums/showthread.php?t=438