Hey Guys,
Have had this problem also, found this on sisoftware's site :
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Q: Sandra locks up at splash screen in Windows 200X!
A: Check the drivers for the ATA controllers and/or SCSI host adapters. Specifically:
A HighPoint (HPT370) ATA controller: make sure you're using the 1.2.0612 or later drivers (not the 1.1.xxx drivers). Also, update the ATA controller BIOS to the latest version.
Adaptec/Roxio WinOnCD 3.x: uninstall the CD-ROM emulator device driver or disable it.
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I've tried updating to the latest HighPoint drivers, but cannot upgrade the bios since it is an on-board Highpoint (Epox 4BDA2+). You may have more luck if you have an add-on card, because I remember having this problem with my old BX133-RAID, and fixing it by updating the mobo bios (which updates the Highpoint bios too).
Ah well, it's worth a shot
cheers
tweakr