The Problem atm is, some Trojan/Virus Download Tools you get very easy over the internet and no Antivirus System Know the Loader. Most loader Hack the WinLogon System and install it self as a special Service and latter it Download many Virus, Trojan, Worms... with I have say, look for a process called Rundll, this need the loader and watch the system, if you install things then you use normaly the rundll process, and automaticaly activate the Virus ;-) . You have Clean up the Temp and the virus don't find anymore the other dll in Temp. look in your System Folder and check if you have dlls like gEWQjjJa.dll very unknow.