I have the same, a DXR3 board. searched high and low for a driver for XP. What OS are you running cuz they have a driver for all OS's you can use. They have a product that uses the same chips as the creative card. I currently use that driver and it works great. The player they provide with it enables you to use Dolby Digital 5.1 through AC-3 ouput which is nice and it is full screen too.
http://www.sigmadesigns.com/support/downloads.htm
select the Hollywood Plus from the "REALmagic legacy products" list for the OS you have.
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My System Specs:
Viewsonic E790B 19" Monitor
MSI 865PE Neo2 - FIS2R
P4 3.2Ghz HTT
Thermaltake Spark 7 HSF
2x512mb Kingston HyperX DDR400Mhz
Leadtek A350 TDH Ultra (FX 5900 Ultra)
(480Mhz core, 930Mhz memory)
35GB Maxtor/Quantum Ultra160 SCSI
Sound Blaster Audigy 2 ZS
Antec Performance Plus 660B case
400 Watt PSU
WinXP Pro