I only use windows defender anti-virus for my windows PC. Do i need to install a better anti-virus to
prevent my PC from a hacker? btw I also use ledger nano to hodl my coins.
Ledger Nano and/or Trezor is a good choice ( please read the replies above). Windows are not very "keen" to protect you from "hackers" and/or viruses and i think that Windows Defender is not a good choice for AV. Why dont you download some of the Free Antiviruses available like AVG/Avast etc ?