How do I remove all viruses and make sure my info is protected?

[Microsoft Windows]

Im so upset and worried. I somehow was trying to call a Microsoft support tech and looked up a number that led me to a scammer. Now my computer has a Trojan horse virus. I have been running defender. It says it blocked it and has been removed. I’m so new to all this tech stuff and I can believe I fell for this guy saying he was tech support. I allowed him remote access and I’m terrified of what information he stole. I have spent the last 13 hours trying to figure this out. Please please can someone help me. Thank you.

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