Boot freezes on Starting Windows 7 screen

[CyberMarine]

You know the Windows 7 start screen where the 4 little red, yellow, blue, and green dots swirl for form the Windows 7 logo? Yeah my system sometimes -- not always -- freezes before the dots come together.

Any ideas how to go about diagnosing and/or fixing this problem? System specs are in my profile. TIA.

[Menthol]

There is also 2 dram voltage settings, one named eventual, sometimes setting eventual to the memory kits rated voltage and the other a little higher helps getting through post