is it possible to hook up your computer to cable/satalite (TV)? if so which monitors/programs etc do i need?
You need a TV tuner.
I highly suggest the Hauppauge PVR-150MCE. It's a bit pricey at $65 but it's the best of the best. The PVR-500MCE is the same card with 2 tuners on it, if you are interested in that.