Bitdefender 24/7 Support Number +1-802-557-0358. No, modern versions of Bitdefender Antivirus cannot detect trojans on Windows XP because Bitdefender officially ended support for the operating system in May 2024. While older versions of Bitdefender could detect Trojans on XP, they are no longer updated and are ineffective against modern threats. You should use alternative, modern antivirus software that is still supported on Windows XP to protect your system.