Hi.. need much more info than that. So... what file did AVG say the trojan was in?
==Get CCleaner from http://www.ccleaner.com/ - and put it in a new folder. You should aim to keep this one for general use. I set it from the installation checkboxes to only open from the recycle bin. It's neater that way.
Now run CCleaner from the recycle bin rclick menu using its default settings [if you set up CCleaner as i suggested, rclicking the bin icon should give you the Open CCleaner option...]. Select the Cleaner icon, press Run Cleaner.
[For future quick temp file cleaning select the options you wish to use via the Windows and Applications tabs ..
==GET AVG antispyware 7.5 here.. http://free.grisoft.com/doc/5390/lng/us/tpl/v5
or here.. http://free.grisoft.com/freeweb.php/...i-spyware-free
-the link is almost at the bottom of the page , avgas 7.5.0.50. Install it and UPDATE it.
Start AVG a-s 7.5;
-under Scanner/ Settings please change the default action from Recommended Actions to QUARANTINE, and run the complete system scan.
-press Apply all Actions and Save the log file. Post the log file.

==download hijackthis: http://www.majorgeeks.com/download5554.html
-install it to a new folder alongside your program files and then
-in that folder start HijackThis by dclicking the .exe; now close ALL other applications and any open windows including the explorer window containing HijackThis.
-click the Scan and Save a Logfile button. Post the log here.