You are supposed to do these scans in Safe Mode, or Safe Mode with Networking
to get rid of your particular trojans.
And if downloading was your only user account problem, yes, the infection
could be the problem.
All info on how to remove it is, hopefully, below.
http://www.spybot.info/en/index.html
Spybot Search & Destroy 1.6 is a very good, FREE Anti-Spyware Program.
Download, install, update, and immunize your System with it.
Then SCAN with it.
Update it, and scan your System once a fortnight.
http://www.malwarebytes.org/mbam.php
Malwarebytes is as the name says, a Malware Remover!
For the Free version scroll down their page to either download from
Download.com, or Major Geeks.com
Download, install, and update.
Important re: Safe Mode
If you happen to find a problem that you can’t uninstall / delete, reboot
the computer, and go into Safe Mode.
To get into Safe mode, tap F8 right at Power On / Startup, and use UP arrow
key to get to Safe Mode from list of options, then hit ENTER.
RESCAN your computer with your Anti-Virus, Malwarebytes and Spybot S & D
while in Safe Mode.
If unable to install above Programs in Normal Mode:
Sometimes Trojans, Viruses, Malware, etc stop you installing and/or updating
Programs to remove them.
If that happens, reboot into Safe Mode with Networking, and install, update
and scan from there