Problem booting up windows account - desktop won't load and task manager disabled ?

I have had an issue with my media center PC for a while. Whenever I boot up it will not load my desktop, my wallpaper comes up but that is it. I usually hit ctr+alt+dlt and go to task manager and run 'explorer.exe' and everything boots up in no time. However, I turned it on today and my task manager has been 'disabled by my administrator'. Well I am my administrator so that seemed strange. I played around for a while and got nowhere. I then logged into the 'administrator' account built into windows and the task manager was enabled for that account (I have to manually run explorer.exe for that account too). The task manager is only disabled on my main account, not throughout the computer. A yahoo search of 'task manager disabled' turned up results, but none of them worked (manually changing regedit.exe and gpedit.msc). Any help here would be greatly appreciated.