Talk to whoever setup the domain policy to disable logon. Anything else would be attempting to bypass a set security or usage policy, which this forum does not help with, nor is it a good idea for your employment status.
you are a typical dickhat it guy.
maybe ctrl alt del disabled by some malware program written by all those so called professionals.
same happened to me when i test some software from a so called very reputable company and my pc was completely locked.
oh for the record these pros are called antamedia kiosk software.
complete reinstall needed and hours of backup due to these muppets