Downloaded the program, ran the setup installed it and ran it
What program is that? Always take caution when downloading and installing any program. Even without anti-virus
(of course it's a must have), as long as you know what you are doing, you will not be a victim of a fraud software.
I bought bullguard antivirus straightaway and ran scan which found viruses. I changed my passwords, reinstalled windows and changed passwords again. I thought that was it.
Can you show some logs here and let's check what are those. Can't draw out yet the real picture behind your case.
i am afraid they can take all my money from my bank accounts
The moment some shitty activity happened to you and you suspects that your bank accounts have chances to compromised, you can asked your bank to take some necessary actions if withdrawal is not the possible or you don't want to initiate.