Panda Software, a virus prevention technology firm, recently announced the top 10 viruses detected by ActiveScan, its free online scanner. At the very top of the list is Downloader.GK Trojan.  This also marks the first time that a trojan tops the list, normally occupied by worms.  The trojan is installed when an unsuspecting user agrees to download a specific ActiveX control, which then installs and runs two adware programs on the computer it infects. 

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