Blue screen on startup. Stop code: KERNEL SECURITY CHECK FAILURE

[TRSpider]

When I start up my laptop, after arround a minute I get a blue screen with a stop code: KERNEL SECURITY CHECK FAILURE.This started happening today out of nowhere when I was watching youtube (dont know if thats relevant).I havent installed anything sketchy off of the internet so Im sure its not a virus and I get notifications about updates so I dont think its outdated updates (might be tho).The laptop is arround 3 years old and its a lenovo ideapad. (Not sure about the whole name)Please help I have a lot of important files and cant access them.Thank you.

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