Desperate for  help

I  bought  a new Dell workstation T7400 with windows vista 64 as first OS. I am trying to install windows xp 64 bit (as second OS multi boot)  . I have partitioned my SATA 750 GB  to  partitions  using windows vista disk management tool. I have encountered the known  problem of windows xp cannot see my hard drive.  So I have done all the steps of pressing F6 and loaded SATA drivers with a floppy drive. I am still getting the same problem and windows cannot detect my hard drive. Please help!!!!!!1

 

 

Workstation T7400

windows Vista 64 bit

SATA 750 GB with 4  NTFS partitions.

ESB2 Intel chipset

2 Xeon 3.16 processors

32 GB RAM