A program that is running as antivirus on the computer but is not installed?

I have recently noticed when I was trying to upgrade my anti-virus software that there was something Lavasoft Live on there stating that this was installed. I have not installed software and when I go to look for it on my programs list, it can not be found so I did a file search and found it but the only option I had was to un-delete. I was wondering was this a virus or anything else that can be hazardous to my computer?