I highly doubt vga.dll versus AMD/NVIDIA driver have much effect on power draw--at least not to a great enough extent to cause a BSOD. My guess is the drivers are not a match for the card or the drivers are simply bad. If the card came with a computer, get the drivers from the computer manufacturer. Otherwise, try different drivers from AMD/NVIDIA/etc.
It's unlikely the Raptors pose any additional strain on the system. Here are the electrical specs of a high speed, high capacity WD1500AHFD (160GB-Raptor/10,000rpm/3ms avg latency/4.6ms read seek)
WD Raptor power values are in fact often lower than some "standard" hard drives people use, and about the same as what I would consider the "average" hard drive these days. The 4 drives in my basic system each draw more power than this Raptor on both the 12V and 5V rails.
WD1500AHFD Raptor 160GB
Read/Write 470 mA
Read/Write 875 mA
Power Dissipation Read/Write 10.02 Watts
(Total Power in his system=10W x2 =20 Watts)
An older HP CD-RW drive (model LTR-52327SHP) I used to have in my basic system was spec'd at:
1.5A@ 5VDC That's a total of 26 Watts
My non-Raptor IDE 160GB drives are EACH spec'd at about: Power~15Watts
Total Power = 15W x 4 = 60Watts
I'm speculating that without drivers, the video card memory usage is minimal. With the drivers, I would bet memory usage goes way up and there are a lot more transitions, producing more heat (actual state transitions are usually when the most power is dissipated)
I would also imagine that with the special drivers the card is able to offload significantly more processing that otherwise would be handled by the system CPU. Again, more power would be dissipated by the video card.
I've read that a video card memory monitor is available, but I don't know where it might be found. If you can find one, you can compare memory usage between "with high-performance card drivers" and "without high-performance card drivers".