Windows 10: PC suddenly very slow and BSOD

So I bought a new PC one month ago and it was working fine the first few days, but then I started getting BSOD on startup. It would happen rarely so it didn't bother me that much, but yesterday my PC suddenly got very slow. I couldn't play games I used to play, every time I start heavier games I just get BSOD, I looked in the event viewer and all BSOD-s I got on this PC are Kernel-Power. The error that was shown on BSOD was mostly iqrl_not_less_or_equal.I tried updating drivers, scanning for malware with Kaspersky Security Cloud, I also tested it in cinebenchR23I would usually get 16k-17k but

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Extremely slow pc suddenly windows 8.1

Windows 8.1 suddenly my pc is extremely slow any suggestions please

 

PC slow and not responding

Hi,

To assist you with your concern, we suggest you to run the System Maintenance Troubleshooter to check and see why your PC is running slow and unresponsive. Here are the steps:

• Press Windows Key + X.
• Click on Control Panel.
• Select Troubleshooting. If you cant find the option, click View By and select Large Icons.
• On the left pane, click on View All.
• Click on System Maintenance to run the troubleshooter.

You may also check on the article below for tips on how to improve your Windows 10 PC.

Tips to improve PC performance in Windows 10

Let us know how it goes.

 

PC reboots (no BSOD) on CPU stress

Hi fellow TPU members,

not too long ago, the box my gf's PC was transported in gave way on the stairs. Yes, you got it right, that sent a PC tumbling down a flight of steps alright.

Stuff broke. Also, stuff remained intact somehow.

I bought her a new case, new CPU cooler and we removed the floppy drive, so far so good. But the PC started crashing for no apparent reason, without a BSOD.

I tested:

• Memtest86+, left overnight, 0 errors
• Scanned the HDD for errors, nothing there
• Left FurMark burning up the GFX card and drawing some power, no problems there
• Ran Ubuntu from a Live CD doing nothing special, didn't crash
• Ran OCCT, Linpack, Prime95, all 3 caused reboots within minutes
• Oh, and I disabled "Restart on error" so I'm sure it's not a BSOD.

Now, I can still try and test something CPU intensive on Ubuntu, but my guess is the CPU didn't survive.
Before I do anything drastic like whippin' out the magic wallet and get her a new AMD quad, is there anything I didn't see?
I'm guessing the motherboard could be borkered as well, but can I check that other than replacing the CPU with a working one?
Any suggestions on which proggies I can use from an Ubuntu Live CD to stress the CPU?