Hello Yvette

,
A backdoor is a backdoor. We can't say this backdoor is not so dangerous than another one.
A backdoor gives intruders complete control of your computer, logs your keystrokes, steal personal information, passwords, etc.
This allows hackers to remotely control your computer,
steal critical system information and
Download and Execute files.
The reason we advice users with backdoors to re-format and re-install their system is because we do not have a way to know that after we clean a compromised pc, will be like before.
Some users with backdoors don't have the installation disk of their pcs, so they ask from us to clean them. We can't quarantee the pc will be in the shape it was before the backdoor infection.
Having all those in mind, since i didn't find the backdoor your protection programs warned you about, if you still believe you were so heavily infected, and you use this pc for bank payments etc, you might think to re-format and re-install your system. It's up to you.
It would be a good idea to change all your passwords from another computer.
Since i haven't really seen the infection, you gave me only names, i can't be sure if it was a backdoor. Your mouse maybe was faulty, and too old as you said and if an infection was on your pc, it could be possible affected it.
Nothing for sure though.
An advice from me, since you are safe surfing the net now, is never to use any Peer to Peer programs to download stuff on your pc, or download cracks, keygens, illegal programs, all those can bring multiple and dangerous infections on your pc. Also do not click on suspicious links, open emails sent to you by unknown persons, even if they say they send a picture to you.
Hackers use these ways to make users open the emails, and click on links, to get control on their pcs.
Unfortunately you have to defend your pc, from all these and keep it protected the best way you can.
I'll be hanging around 1-2 days more, and then i'll let you go, and try to help some other people in need.
I've talked to much, i'll let you download the programs you want, and i'll be waiting your new HijackThis log.