WinDVD2000 v2.2 will stop playing with C Stepping CPU. This is a compatibility issue between WinDVD and C-1 stepping cpu. WinDVDver 4.0 and above can fix this issue. For WinDVDver 3.x, there is a cpuugrade patch file from Intervideo.
For explanation on installation please refer to chapter 4-1-4 of the manual and look under section: "Configuring SATA Hard Drives - Intel ICH8RSouthbridge", and you can click here to download Intel ICH8RSATA RAID manual.
The power connector near to onboard AGP Pro slot provides extra power for memory chips on AGP Pro VGA card only. Therefore, if your AGP VGA card has extra power connector, please connect the proper power cable the power supply provides later.
Based on product specification, the board you have does come with nFORCE 3 Ultra chipset, not nFORCE 3 250 chipset. We have confirmed this symptom with nVIDIA. This is because nFORCE 3 250 series chipsets use the same device ID and cause wrong H/W detection report.