these are the files:

http://i.imgur.com/cnZav0r.png

these are the source i think, i got them from my USB flashdisk which came from another computer. But a computer with avast can clean my USB flashdisk

http://i.imgur.com/mhgFRig.png

contents of the autorun

http://i.imgur.com/pNvszZe.png

if i try to delete these files, they just come back with a different filename.