I want to make a DVR (digital video recorder) or CCTV setup hooking upto 16 cameras on a computer ,some of the cameras will be motion sensitive ie only record when it is trigered for a set period of time,and some will be recording in a continous loop ,for 2 months the last day gets written on
I have already seen such a system in a shop but it is running windows xp
I have seen some dvr cards on e bay where u get software free as well ,but that only runs in xp
I have googled around and found some sites for PVR setup
I dont think i need expensive tv cards
Any help in the right direction would be appreciated ,what kind of software ,hardware would i need

Thanx in advance