The most common reasons are: 1. Drivers, 2. AHCI BIOS/IDE Windows, 3. PSU, 4. BIOS setting(s)/corruption, 5. Bad component.
1. Event Manager, look at the Critical errors listed and post them here; see below.
Run MSCONFIG and select Diagnostic Mode, reboot, and test. Does that correct the problems including BSOD?
2. AHCI BIOS/IDE Windows - IF the BIOS is set to AHCI and Windows Start = 3 (IDE) you'll get all sorts of problems. To fix this, run 'Fix it' or manually change the registry values. Remember:
BIOS SATA -> AHCI <=> Start = 0 /OR/ BIOS SATA -> IDE <=> Start = 3.
Fix It -
http://support.microsoft.com/kb/922976
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\IastorV
3. Question - What PSU? How old?
4. What BIOS Changes above 'Load Defaults' were made?
5. Try booting and Testing with (1) stick of RAM in the 2nd DIMM slot from CPU.
Question - What EXACT set of Dominator GT 3x4GB or 6x2GB? I prefer a link.
Question - {see #4} What BIOS settings? In 6x2GB DO NOT use XMP!
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