I have a Dimension XPS 600, Intel Pentium D Processor 940 (3.2GHz) w/ 2MB cache. with (2) 250GB SATA II Hard Drives (7200RPM) and 512MB NVIDIA GeForce 7900 GTX video card. I tried to install winxp 64 bit on the computer but the software can't see the harddrives. To check I reinstall winxp pro up to the the point of hard drive detection and the drives can be seen. how do resolve this problem so i can install win xp 64 bit? Thanks in advance.