No shut down icon in start menu

[Son of Sam]

alright this is a very annoying problem i have on my hands. as the title says, i dont have the shutdown option in the start menu or when i press ctrl alt del or in the task manager. i have no idea whats going on. i went through the local security permissions and the network security permissions and i didnt see anything out of the ordinary. around the same time this happened i also noticed that i cant click on my desktop anymore. i dont have icons on it, but i cant right click and get the pulldown menu or click on the desktop to get rid of the start menu. i dont know what could have caused this or when it started.

im running XP Pro SP2