how to remove security on this computer?

Answer 1

Not sure why you are asking, maybe you shouldn't if you are not the admin, if you aren't it there for a reason
not to mention leaving yourself vulnerable to all sorts of viruses and spam and spyware

Please don't be offended but if you are at a computer and at work and trying to over ride security so you can browse the web, the locks are there for a reason

Answer 2

First off, we need more information as to what kind of security you are referring to.
Second, why are you needing security removed in the first place?