I have a xbox hard drive that I want to put in an old pc along with the other hard drive. I know it's possible but can anyone tell me how exactly to do it? Thanks in advance

Oh yeah and since I dont have a monitor for this pc can I hook up a tv to be used as the monitor if so what kind of cable do I use or how would I do this?

There is nothing special to hooking up an XBox harddrive in a PC. You install the HDD just like normal, and you format the drive just like normal.

As far as using a TV as a monitor, you need a video card that has a TV output.