Instructions
Set up a Media Server with Windows Vista
Open Windows Media Player.
Right-click on "Library."
Click on "Media Sharing..." A window will open.
Check the box that says "Share my media." Within this window a list of devices will appear. Click on your PS3 system to highlight it.
Click the "Allow" button to allow the PS3 to access your files.
Search Your Network for the PS3
Right-click the computer in the bottom right corner of the screen, and select "Network and Sharing Center" to open your network settings.
Double-click on your router to display all of the devices on your network. The router icon is in the middle of this window (it's a house-shaped icon between the PC icon and the world icon representing the Internet).
Find and select your PlayStation 3 system name from the list that appears.