There's a policy installed locally on that machine. You apparently got that from someone who had it at home an was a guru or from a company that locked settings from users abilities... I'm assuming this is beyond your scope, but here it does. You'llhave to do a lot of playing around, becauseit's been a few years since I messed with this.
Look in your start menu for something called System Policies. If you don't see anything, try running "poledit" from the run line. Here's where my memory slips me big time... Look through the settings for the default user and default computer talking about desktop settings.... Play with them, and good luck.