1. Have to have DVR connected to network through either an ethernet cable or an access point like a Wireless N Gaming Adapter
2. Download Directv2Pc software
They ask for your email and give you a code for 2 pc's to authorize
3. You should be ready to watch your DVR from your computer. To send data from your PC to dvr, a lot of people use a program called Tversity as it transcodes your shows on the fly into the right format to be read by your dvr. To access your content just go to Menu and you will see something called music, pictures, etc.
It seems people have trouble with the latest version so 1.7.4 works great, just tried it myself
I guess with the paid version you can even stream hulu and stuff to your dvr