what kind of software do I need to record security footage onto a computer

Is there any software/ programs that are required to record activity from a security camera? We are in desperate need to find a semi cheap way to do this, since the company where I work is too cheap to pay for a system that would prevent them from getting ripped off.

We are experiencing a rash of break-ins and need to catch these jerks before they strike again.

Thanks for you advise!