Hello. Now my friend's roommate was playing games online, and an IE window popped up saying a file was infected with some two-hundred something trojans. Anyone with common sense would see that is a scam to load viruses on the computer by clicking on it. My friend's roommate clicked on it though and now it won't go away. His computer eventually wouldn't let him click on anything. He somehow got to click on stuff, and I told him to install avast! and run a boot-time scan, which he did. It found a trojan and he said he deleted it. However, afterwords, the window still popped up, and he did another scan which revealed 3 more infections. Could you please maybe identify this threat and give a way to remove it entirely?