Every time I run windows defender and do a full scan it always crashes after a certain percentage. BSOD error is unexpected store exception, I have windows 10 and malwarebytes installed as second antivirus
Update your post to include full system hardware specs and OS information.
What is the value of that "certain percentage"?
Does the problem end if Malwarebytes is disabled and/or uninstalled?
Look in Reliability History and Event Viewer for related error codes, warnings, and even informational events.
Overall, I think the PSU is a likely culprit.
PSU: make, model, wattage, age, condition?
FYI:
Best Power Supplies of 2021 - Top PSUs for Gaming PCs | Tom's Hardware
Run 2 or 3 of the listed calculators along with your own manual total. If any component has a range of wattage values then use the highest listed value. Or recommended PSU wattage if that is provided.
Even a new PSU of the applicable wattage can be problematic depending on make, model, and quality. PSUs are tested in ideal, not real world, environments.
An immediate solution of sorts is to limit what all that is running. Remove apps etc, from Start up in Task Manager and use shortcuts instead so you can conveniently start and stop programs as you wish.
I would not constantly run, for example, Malwarebytes. I just run that app from time to time or after some unexpected encounter with a website that proves dubious. (Which happens when I am doing research and some promising google hit turns out to be click bait.)
Limiting what is running may be only an interim solution especially if the PSU is nearing design EOL (End of Life) thus continuing to degrade and unable to fulfill power demands/spikes.
At least you will be able to play and gain a bit more time study the problem and start thinking about a replacement PSU.