Heres a list of the old (possibly infected) external hardware i reused on my brand new computer.
A standard keyboard.
A standard mouse.
A cheap headset.
Also what about an original windows vista dvd disk, the disk was used many times in the hacked computer, in a dvd rw drive, could malware have been burnt on to that dvd disk to pass on the infection to other computers that read from or install windows from the disk?
EDITED, to add the router to the list.
Edited by markitup, 12 May 2011 - 10:43 AM.