I think that we may have found it Daz without needing to take the card out possibly
SYMPTOMS
After you install Windows XP Service Pack 1 (SP1), IDE ATA-133 (Ultra DMA Mode 6) devices on motherboards that use VIA Technologies chipsets are not enabled. This occurs although Windows XP SP1 supports Ultra DMA Mode 6.
CAUSE
When you install Windows XP SP1, devices on your computer are not reinstalled in the process. The Ultra DMA Mode 6 devices were not supported before you installed Windows XP SP1.
Try this :
To resolve this issue, update the driver for the IDE controllers in Device Manager. To do this, follow these steps:
Right-click My Computer, and then click Properties.
Click the Hardware tab, and then click Device Manager.
Expand IDE ATA/ATAPI controllers.
Double-click Primary IDE channel, and then click the Driver tab.
Click Update Driver.
Click Install the software automatically, and then follow the on-screen instructions to complete the process.
The full article is here :
http://support.microsoft.com/default.aspx?scid=kb;en-us;327805