Does re installing a new operating system rid you of any keyloggers/RAT programs?

Not much knowledge on this stuff so please bare with me. My PC was built by someone I know. I was present when the computer was being built but the operating system was installed using their own usb with a trial version of windows to get me up and running. I’ve had paranoid suspicions that this person could of easily added a malicious program onto my computer while building it. I have since purchased a new SSD and my own version of windows pro. Would this be sufficient enough to rid my system of prying eyes or could said programs be installed in a way that a new SSD and OS would have no effect on it. Is there an easy way to tell if someone has had access to my PC remotely.

I run virus scans regularly but I’m sure having a program hide from anti virus is basic stuff.

submitted by /u/kingcon35
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from hacking: security in practice https://ift.tt/4HfLM1z

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