I am also having a hard time installing Vista Ultimate x64 on my machine. I have the proper hardware yet in the middle of the installation it freezes or bluescreens. I will give you a more detailed report of what the BSOD stop code is if you need it. Here are my specs:
AMD Athlon 64 X2 6400+ Windsor 3.2GHz Socket AM2
ASUS M2N-SLI Deluxe AM2 NVIDIA nForce 570 SLI Mobo
G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)
Western Digital Caviar SE16 WD5000AAKS 500GB 7200 RPM SATA 3.0Gb/s HDD
SAMSUNG 20X DVD±R DVD Burner SH-S203N
LITE-ON 20X DVD±R DVD Burner LH-20A1L-06
I feel like it might be a problem with my hardware because I couldn't get 64bit versions of Ubuntu or Xubutnu to install either. Any ideas would be greatly appreciated! Thanks.