Try booting with a "boot log" and then boot again normally. The log file should tell you where it is hanging up. Then try the step by step boot, loading drivers one at a time.
You could always boot to Safe Mode and selectively remove devices, and let Windows detect them again. May...
Though it does sound like your C drive may be corrupted, the fact that your A drive is not working and you have no D drive sounds like you should first check your BIOS. All the basic hardware settings are stored there, and if your hard drives are not detected in the BIOS, you won't get any...
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