My User Accounts window just won't open up. In the control panel, when I click on it, the hour glass cursor appears for about 3 seconds, and then stops. No window opens up! All the other shortcuts in the control panel work just fine. I've tried accessing it through the Run command, but nothing comes up. I've restarted my computer many times, which hasn't seemed to do anything, and the account I am using is the only one on the computer. What should I do? Thanks.