What is a Trojan Horse.

it is if you cant get rid of them

Recheck 10 infected all trojans.

How long does it take to scan alll the computers files?

A long frigging time, depending on how big your harddisk is and how much you've got on it.

only 20GB

So about 10 - 20 minutes I guess

Norton busts all of the time, free systems are good, but a steady protection program is a good idea.

Is the hard drive split when you have multiple usernames for the computer?

There are different kinds of trojans.. and they may be
employed to do different kinds of jobs.. they all are
obtained through the back door method (as the greek
trojan horse similarly did) via a picture or downloaded file.. advertisement, etc. some of them check for passwords..
others may search your mail, leech your
internet connection, and ultimately either crash or reboot
your pc on a consistent basis.. most trojans communicate
with a remote location, and broadband connections are
easiest to infiltrate as their communication with the
internet is constantly on.

Yeah, its probably best to scan all of the seperate files.

Well its scanning the whole computer not just my name. Therefore it should take, what..... 1hr, seeing as I have the bulk of the computers material.

most cases with trojans result in a need to reformat, as the files it winds up corrupting are the important system registry files. there are a few cases where a simple virus scan cleans them up.. so heres hopin 😉

Originally posted by Time Of Evil
Posting Here because I should get an immediate reply.

What is a trojan horse? I have some one my computer.

...It's not called "trojan horse"... just trojan. Don't confuse history with the end of your computer 🙂