As I mentioned in the title, I am afraid that there is a rootkit on my computer. Let me tell you what I experienced from the beginning.
About 3-4 days ago, unfortunately, I ran a setup file and nothing happened on my computer at first. I suspected from this and scanned directly with Hitmanpro and it found a virus and I manually deleted this virus. Then I scanned with the free versions of Malwarebytes and Kaspersky and nothing was found. The next day, I saw in my steam account that my items were sold without any notification, even though I had a steam guard. I had my computer checked on virustotal, and I still couldn't find anything bad. The next day, I did not even receive a login notification from my Instagram account, and even Instagram was not logged in from another IP address or device (at least as far as I could see). The situation started to worry me and I decided to format my computer locally. After formatting, I changed the passwords of my accounts that I thought might be affected. I canceled my bank cards. But I still have a question in my mind. I don't feel comfortable thinking that it is somehow stored somewhere on my computer even after formatting. This time, they make me think that I was saved because I formatted it, and in the meantime, I still think that they are silently stealing my information.
How can I clarify that if they are still stealing my information?