Is it possible to setup my computer as a DVR and use it with my Dish Network Standard Receiver (322)? I would rather do this then purchase their DVR.
Yes you can but you need a video capture card some like this
and some software like this (You can watch the little video and get the point.)
Here is some resource links, I think you can get the point.
And you will be limited by the fact that the channels will be tuned and have to be manually changed on the Dish Receiver, so any program guides on the PC will not work.