Lenovo X120e X Series ThinkPad :: Bluescreen On Windows Startup?

Recently, my x120e began blue-screening (with error code c000021a)  while Windows was starting up. However, if the computer was off for a period of time, usually about 5-10 minutes minimum, it would start up with no problems. I thought it might be overheating except for two things:

1) Once windows started up, I had no issues. No matter how much processing power I was using, it didn't bluescreen or even try to turn itself off

2) When I rebooted in safe mode and looked at what modules it was loading, it always failed after the same one (CLASSPNP.SYS)
 
I had heard that there were occasionally some significant driver issues with my hardware, so I did a clean re-install of Windows (Win 7 Pro, 64-bit), hoping that this would rule that out.

The issue persisted, and in fact would interfere with a Windows install disk booting into the installer. After I got the installation to complete, the previous issue continued to be present.
 
I did some Google searching and found that the BSOD error code c000021a is generally caused by a driver or security issue, and the usual solutions suggested are to try to use the "Last Known Good Configuration Option" for windows startup, and to update drivers. However, neither of these things have worked, as it still does this on a fresh Windows install.
 
I also tried running without the battery (AC power only) and without the AC power (battery only), and neither has fixed the issue.
 
(Side note: This was originally happening with the original 320GB hard disk that came in the machine. I was going to upgrade to an SSD anyway, and this problem has persisted with the new drive).