Don't know if these changes will translate or not, but you could try using safe mode to unset those things. Otherwise, call in the company IT people and let them earn their pay.
Hi all, a co-worker turned on _all_ of the accessibility options on my PC as a gag and turned off the computer. Upon being presented with a logon screen, any keypresses made result in an audible 'bong' noise, the title bar of the 'press ctl+alt+del to login' window flashes and the keystroke appears to have done nothing. At this point, I cannot press ctl+alt+del to be able to log in. Any ideas?