Download details: Windows XP Video Decoder Checkup Utility

Download details: Windows XP Video Decoder Checkup Utility: "The Windows XP Video Decoder Checkup Utility helps you determine if an MPEG-2 video decoder (also called a DVD decoder) is installed on your Windows XP computer and whether or not the decoder is compatible with Windows Media Player 10 and Windows XP Media Center Edition."

Viewing Hidden Devices

To view phantom devices set the variable DEVMGR_SHOW_NONPRESENT_DEVICES to 1. You can add this to the system environment variables.