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Hmm, I think the only thing you can do is try it again with the USB virus scan. If it doesn't detect any threat it's not worth the money or it doesn't work properly. Maybe you uninstall the software and install it again to see if this changes anything. Hopefully you have saved the results log of the first scan - then you can compare them.
It is only good for scanning/protecting the USB drive it is installed upon. It is not designed to scan any machines that you connect that drive to.
I.E. It isn't intended to be a portable virus scanner.
The first infection is know to the database under a different alias: http://vil.nai.com/vil/content/v_147533.htm
The others I can't find.
That's not to say they shouldn't be there, in fact they may well be there, under an alias, but many infections that are of indeterminate types are not covered by major anti-virus applications anyway and you should be carrying anti-spyware as additional protection in case of emergencies, such as SuperAntiSpyware or SpywareBlaster.
A good one to use sparingly is MalwareBytes Free, but I wouldn't keep it installed as it is pretty drastic.
Those applications need to be installed on the hard drive, not on a USB drive.