Help Please?

I'm currently using:

Pentium D 830 Processor (3GHz)
4x512MB 533MHz DDR2 RAM
250GB 7200rpm S-ATA HDD
Radeon X300 (128MB)

The OS is XP MCE 2005 and I was looking to do a fresh install of XP Professional by formatting the HDD and installing it. I run into a problem when I boot from the XP Pro CD. I get to the part where I'm supposed to choose which HDD or Partition to install the OS on, and it displays "Unknown Disk" throughout the list. I reset my BIOS settings to default but it didn't solve the problem. I can boot up my computer without a problem but I don't understand why it won't show my partitions or my HDD so I can do a fresh install of XP Pro. I also tried this with my 4GB Kingston FlashDrive and it worked fine... What seems to be the problem?

Under device manager, the HDD is displayed as
"WDC WD2500JS-98MHB0"

Thanks a lot,


xbosnax