surveillance security camera and PCI?

I am thinking of getting a security surveillance camera it says it is windows vista compatible it will come with a card that I must insert into the PCI slot where is that. also another that i am looking says that a pc must have a dvr does anyone know if my pc have them things mentioned. I have a 2007 compaq Presario Windows Vista Home Premium? thank you I really just don't know about computers.
thanks mexicanc,I have a desktop so I will be looking in that area.