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Windows 7 Enters Restart Loop: Error c000021a among others

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Hello, let me start by saying thank you for any help you can provide. My level of tech knowledge is pretty high, and yet I am stumped by this issue. I know this community is a source of high quality reliable knowledge, which is why I turned here both in the past and now.

So, here is what is happening. My computer suddenly restarted on me this morning and when it tried to boot, I receive the dreaded blue screen of death with the most reoccuring error being c000021a. However, this is not the end of the problem.

Sometimes it won't let me enter into safe mode, or even run the repair diagnostics. Other times it will. Sometimes it will almost load safe mode et al. but then end up on a perpetual black screen with nothing happening. Other times the monitor will simply wig out and flash a ton of bright colors at me. Yet other times safe mode will start up fine and a black screen will randomly appear while I'm working.

It goes without saying, but I have attempted a system restore to no avail several times. I have uninstalled recently installed programs whilst in safe mode, and I have run ever repair diagnostic I can think of. Nothing seems to be fixing this issue. Oddly enough, I only have two system restore points available, and selecting "View more" does not make any more appear.

Obviously, the next step I can think of is to do a system wipe and reinstall everything, OS and all, but that does not strike me as a great option, and I'd like to avoid that if possible.

I'd also like to throw in that I have not installed any new hardware recently, nor have I upgraded any drivers or downloaded any Windows updates in the past few days. This was pretty much a random visit from the ghost of Windows crashed, and I am at my wits end trying to figure out what needs to be done.

Please, don't assume I've done anything right or wrong, and just give me the best advice you can. I'm willing to try anything possible. Any help is appreciated. Thanks!
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