Trojan horse downloader. purity scan

Help! seem to have the same problem as soccer_chika, when I scan with AVG. I Followed the first part of what was suggested previously by blind dragon. I have a hijackthis report if I post it can anybody help. You seem very clued up I am afraid I'm not.

Challenger
 
click on post reply (not quick reply) and then click the paperclip icon next to the smiley face icon, browse to the log and select upload
 
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