My PC has been lagging for the past three Days and nothing else in my house is lagging on the Internet

[Windows 10]

On the first day, it barely connected to the Internet and it was basically unusable the next day. It would connect to the Internet and I experience my first blue screen within a day two more blue screens followed, and then we are on the third day today I am able to be in a discord call with my friends, but I lag a lot And I’m very delayed. What do I do?

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